s/.txt/.md/
Initial pass at moving the opengl readme from plaintext to markdown. Probably screwed up a lot of stuff.
This commit is contained in:
Zachary J. Slater
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1 changed files with 64 additions and 61 deletions
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opengl2-readme.md
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opengl2-readme.md
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OpenGL2
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<insert ascii art here>
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OpenGL2 is an alternate renderer for ioquake3. It aims to implement modern
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features and technologies into the id tech 3 engine, but without sacrificing
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compatibility with existing Quake 3 mods.
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-------------------------------------------------------------------------------
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FEATURES
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-------------------------------------------------------------------------------
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- Compatible with most vanilla Quake 3 mods.
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- HDR Rendering, and support for HDR lightmaps
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- Tone mapping and auto-exposure.
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- Cascaded shadow maps.
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- Multisample anti-aliasing.
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- Texture upsampling.
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- Advanced materials support.
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- Advanced shading and specular methods.
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- LATC and BPTC texture compression support.
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- Screen-space ambient occlusion.
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-------------------------------------------------------------------------------
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INSTALLATION
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-------------------------------------------------------------------------------
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For *nix:
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1. This should be identical to installing ioq3. Check their README for more
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details.
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For Win32:
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1. Have a Quake 3 install, fully patched.
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2. Copy the following files into Quake 3's install directory:
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ioquake3.x86.exe
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renderer_opengl1_x86.dll
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renderer_opengl2_x86.dll
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These can be found in build/release-mingw32-x86 after compiling, or bug
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someone to release binaries.
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-------------------------------------------------------------------------------
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RUNNING
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-------------------------------------------------------------------------------
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1. Start ioquake3. (ioquake3.x86.exe on Win32)
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2. Open the console (the default key is tilde ~) and type
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`/cl_renderer opengl2` and press enter
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`/vid_restart` then press enter again.
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3. Enjoy.
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-------------------------------------------------------------------------------
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CVARS
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-------------------------------------------------------------------------------
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Cvars for simple rendering features:
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* `r_ext_compressed_textures` - Automatically compress textures.
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0 - No texture compression. (default)
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1 - DXT/LATC texture compression if
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supported.
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2 - BPTC texture compression if supported.
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* `r_ext_framebuffer_multisample` - Multisample Anti-aliasing.
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0 - None. (default)
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1-16 - Some.
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17+ - Too much!
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* `r_ssao` - Enable screen-space ambient occlusion.
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Currently eats framerate and has some
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visible artifacts.
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0 - No. (default)
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1 - Yes.
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Cvars for HDR and tonemapping:
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* `r_hdr` - Do scene rendering in a framebuffer with
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high dynamic range. (Less banding, and
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exposure changes look much better)
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0 - No.
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1 - Yes. (default)
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* `r_cameraExposure` - Cheat. Alter brightness, in powers of two.
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-2 - 4x as dark.
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0 - Normal. (default)
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0.5 - Sqrt(2)x as bright.
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2 - 4x as bright.
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* `r_postProcess` - Enable post-processing.
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0 - No.
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1 - Yes. (default)
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* `r_toneMap` - Enable tone mapping. Requires
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r_hdr and r_postProcess.
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0 - No.
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1 - Yes. (default)
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* `r_forceToneMap` - Cheat. Override built-in and map tonemap settings and use cvars r_forceToneMapAvg, r_forceToneMapMin, and r_forceToneMapMax.
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0 - No. (default)
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1 - Yes.
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* `r_forceToneMapAvg` - Cheat. Map average scene luminance to this
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value, in powers of two. Requires
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r_forceToneMap.
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-2.0 - Dark.
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-1.0 - Kinda dark. (default).
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2.0 - Too bright.
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* `r_forceToneMapMin` - Cheat. After mapping average, luminance
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below this level is mapped to black.
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Requires r_forceToneMap.
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-5 - Not noticeable.
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-3.25 - Normal. (default)
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0.0 - Too dark.
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* `r_forceToneMapMin` - Cheat. After mapping average, luminance
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above this level is mapped to white.
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Requires r_forceToneMap.
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0.0 - Too bright.
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1.0 - Normal. (default).
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2.0 - Washed out.
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* `r_autoExposure` - Do automatic exposure based on scene
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brightness. Hardcoded to -2 to 2 on maps
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that don't specify otherwise. Requires
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r_hdr, r_postprocess, and r_toneMap.
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0 - No.
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1 - Yes. (default)
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* `r_forceAutoExposure` - Cheat. Override built-in and map auto
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exposure settings and use cvars
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r_forceAutoExposureMin and
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r_forceAutoExposureMax.
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0 - No. (default)
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1 - Yes.
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* `r_forceAutoExposureMin` - Cheat. Set minimum exposure to this value,
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in powers of two. Requires
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r_forceAutoExpsure.
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-3.0 - Dimmer.
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-2.0 - Normal. (default)
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-1.0 - Brighter.
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* `r_forceAutoExposureMax` - Cheat. Set maximum exposure to this value,
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in powers of two. Requires
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r_forceAutoExpsure.
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1.0 - Dimmer.
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2.0 - Normal. (default)
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3.0 - Brighter.
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Cvars for advanced material usage:
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* `r_normalMapping` - Enable normal mapping for materials that
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support it, and also specify advanced
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shading techniques.
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0 - No.
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1 - Yes. (default)
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2 - Yes, and use Oren-Nayar reflectance
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model.
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3 - Yes, and use tri-Ace's Oren-Nayar
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reflectance model.
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* `r_specularMapping` - Enable specular mapping for materials that
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support it, and also specify advanced
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specular techniques.
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0 - No.
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1 - Yes, and use tri-Ace. (default)
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2 - Yes, and use Blinn-Phong.
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3 - Yes, and use Cook-Torrance.
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4 - Yes, and use Torrance-Sparrow.
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* `r_deluxeMapping` - Enable deluxe mapping. (Map is compiled
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with light directions.) Even if the map
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doesn't have deluxe mapping compiled in,
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an approximation based on the lightgrid
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will be used.
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0 - No.
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1 - Yes. (default)
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* `r_parallaxMapping` - Enable parallax mapping for materials that
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support it.
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0 - No. (default)
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1 - Use parallax occlusion mapping.
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2 - Use relief mapping. (slower)
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* `r_baseSpecular` - Set the specular reflectance of materials
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which don't include a specular map or
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use the specularReflectance keyword.
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0 - No.
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0.04 - Realistic. (default)
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1.0 - Ack.
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* `r_baseGloss` - Set the glossiness of materials which don't
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include a specular map or use the
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specularExponent keyword.
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0 - Rough.
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0.3 - Default.
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1.0 - Shiny.
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* `r_baseNormalX` - Set the scale of the X values from normal
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maps when the normalScale keyword is not
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used.
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-1 - Flip X.
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0 - Ignore X.
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1 - Normal X. (default)
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2 - Double X.
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* `r_baseNormalY` - Set the scale of the Y values from normal
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maps when the normalScale keyword is not
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used.
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-1 - Flip Y.
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0 - Ignore Y.
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1 - Normal Y. (default)
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2 - Double Y.
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* `r_baseParallax` - Sets the scale of the parallax effect for
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materials when the parallaxDepth keyword
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is not used.
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0 - No depth.
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0.01 - Pretty smooth.
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0.05 - Standard depth. (default)
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0.1 - Looks broken.
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Cvars for image interpolation and generation:
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* `r_imageUpsample` - Use interpolation to artifically increase
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the resolution of all textures. Looks good
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in certain circumstances.
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0 - No. (default)
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1 - 2x size.
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2 - 4x size.
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3 - 8x size, etc
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* `r_imageUpsampleMaxSize` - Maximum texture size when upsampling
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textures.
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1024 - Default.
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2048 - Really nice.
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4096 - Really slow.
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8192 - Crash.
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* `r_imageUpsampleType` - Type of interpolation when upsampling
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textures.
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0 - None. (probably broken)
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1 - Bad but fast (default,
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FCBI without second derivatives)
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2 - Okay but slow (normal FCBI)
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* `r_genNormalMaps* - Naively generate normal maps for all
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textures.
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0 - Don't. (default)
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1 - Do.
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Cvars for the sunlight and cascaded shadow maps:
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* `r_forceSun` - Cheat. Force sunlight and shadows, using sun position from sky material.
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0 - Don't. (default)
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1 - Do.
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2 - Sunrise, sunset.
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* `r_forceSunMapLightScale` - Cheat. Scale map brightness by this factor
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when r_forceSun 1.
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1.0 - Default
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* `r_forceSunLightScale` - Cheat. Scale sun brightness by this factor
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when r_forceSun 1.
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1.0 - Default
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* `r_forceSunAmbientScale` - Cheat. Scale sun ambient brightness by this factor when r_forceSun 1. 0.5 - Default
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* `r_sunShadows` - Enable sunlight and cascaded shadow maps for
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it on maps that support it.
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0 - No.
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1 - Yes. (default)
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* `r_sunlightMode` - Specify the method used to add sunlight to
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the scene.
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0 - No.
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1 - Multiply lit areas by light scale, and
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shadowed areas by ambient scale.
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(default)
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2 - Add light. Looks better, but is slower
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and doesn't integrate well with existing
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maps.
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* `r_shadowFilter` - Enable filtering shadows for a smoother
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look.
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0 - No.
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1 - Some. (default)
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2 - Much.
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* `r_shadowMapSize` - Size of each cascaded shadow map.
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256 - 256x256, ugly, probably shouldn't
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go below this.
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512 - 512x512, passable.
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1024 - 1024x1024, good. (default)
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2048 - 2048x2048, extreme.
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4096 - 4096x4096, indistinguishable from
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2048.
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Cvars that you probably don't care about or shouldn't mess with:
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* `r_mergeMultidraws` - Optimize number of calls to
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glMultiDrawElements().
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0 - Don't.
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1 - Do some. (default)
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2 - Do more than necessary (eats CPU).
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* `r_mergeLeafSurfaces` - Merge surfaces that share common materials
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and a common leaf. Speeds up rendering.
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0 - Don't.
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1 - Do. (default)
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* `r_recalcMD3Normals` - Recalculate the normals when loading an MD3.
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Fixes normal maps in some cases but looks
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ugly in others.
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0 - Don't. (default)
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1 - Do.
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* `r_depthPrepass` - Do a depth-only pass before rendering.
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Speeds up rendering in cases where advanced
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features are used. Required for
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r_sunShadows.
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0 - No.
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1 - Yes. (default)
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|
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* `r_normalAmbient` - Split map light into ambient and directed
|
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portions when doing deluxe mapping. Not
|
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very useful.
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0 - Don't. (default).
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0.3 - 30% ambient, 70% directed.
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1.0 - 100% ambient.
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* `r_mergeLightmaps` - Merge the small (128x128) lightmaps into
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2 or fewer giant (4096x4096) lightmaps.
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Easy speedup.
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0 - Don't.
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1 - Do. (default)
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* `r_shadowCascadeZNear` - Near plane for shadow cascade frustums.
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4 - Default.
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* `r_shadowCascadeZFar` - Far plane for shadow cascade frustums.
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3072 - Default.
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* `r_shadowCascadeZBias` - Z-bias for shadow cascade frustums.
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-256 - Default.
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* `r_materialGamma` - Gamma level for material textures.
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(diffuse, specular)
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1.0 - Quake 3, fastest. (default)
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* `r_lightGamma` - Gamma level for light.
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(lightmap, lightgrid, vertex lights)
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1.0 - Quake 3, fastest. (default)
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|
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* `r_framebufferGamma` - Gamma level for framebuffers.
|
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1.0 - Quake 3, fastest. (default)
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* `r_tonemapGamma` - Gamma applied after tonemapping.
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1.0 - Quake 3, fastest. (default)
|
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|
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Cvars that have broken bits:
|
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|
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* `r_dlightMode` - Change how dynamic lights look.
|
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0 - Quake 3 style dlights, fake
|
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brightening. (default)
|
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1 - Actual lighting, no shadows.
|
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2 - Light and shadows. (broken)
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|
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* `r_pshadowDist` - Virtual camera distance when creating shadowmaps for projected shadows. Deprecated.
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|
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* `cg_shadows` - Old shadow code. Deprecated.
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|
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|
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-------------------------------------------------------------------------------
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MATERIALS
|
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-------------------------------------------------------------------------------
|
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|
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OpenGL2 supports .mtr files, which are basically the same as .shader files, and
|
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are located in the same place, but override existing .shader files if they
|
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exist. This is to allow maps and mods to use the new material features without
|
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breaking the map when using the old renderer.
|
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|
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Here's an example of a material stored in one, showing off some new features:
|
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|
||||
textures/abandon/grass
|
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{
|
||||
qer_editorimage textures/abandon/grass.jpg
|
||||
{
|
||||
map textures/abandon/grass3_256_d.jpg
|
||||
rgbgen identity
|
||||
}
|
||||
{
|
||||
stage normalparallaxmap
|
||||
map textures/abandon/grass3_1024_n.png
|
||||
normalScale 1 1
|
||||
parallaxDepth 0.05
|
||||
}
|
||||
{
|
||||
stage specularmap
|
||||
map textures/abandon/grass3_256_s.png
|
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specularReflectance 0.12
|
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specularExponent 16
|
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}
|
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{
|
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map $lightmap
|
||||
blendfunc GL_DST_COLOR GL_ZERO
|
||||
}
|
||||
}
|
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|
||||
The first thing to notice is that this is basically the same as old Quake 3
|
||||
shader files. The next thing to notice are the new keywords. Here is what
|
||||
they mean:
|
||||
|
||||
stage <type>
|
||||
- State how this imagemap will be used by OpenGL2:
|
||||
diffuseMap - Standard, same as no stage entry
|
||||
normalMap - Image will be used as a normal map
|
||||
normalParallaxMap - Image will be used as a normal map with
|
||||
alpha treated as height for parallax mapping
|
||||
specularMap - Image will be used as a specular map with
|
||||
alpha treated as shininess.
|
||||
|
||||
specularReflectance <value>
|
||||
- State how metallic this material is. Metals typically have a high
|
||||
specular and a low diffuse, so this is typically high for them, and low
|
||||
for other materials, such as plastic. For typical values for various
|
||||
materials, see http://refractiveindex.info , pick a material, then scroll
|
||||
down to the reflection calculator and look up its reflectance. Default
|
||||
is 0.04, since most materials aren't metallic.
|
||||
|
||||
specularExponent <value>
|
||||
- State how shiny this material is. Note that this is modulated by the
|
||||
alpha channel of the specular map, so if it were set to 16, and the alpha
|
||||
channel of the specular map was set to 0.5, then the shininess would be
|
||||
set to 8. Default 256.
|
||||
|
||||
normalScale <x> <y>
|
||||
- State the X and Y scales of the normal map. This is useful for increasing
|
||||
or decreasing the "strength" of the normal map, or entering negative values
|
||||
to flip the X and/or Y values. Default 1 1.
|
||||
|
||||
parallaxDepth <value>
|
||||
- State the maximum depth of the parallax map. This is a fairly sensitive
|
||||
value, and I recommend the default or lower. Default 0.05.
|
||||
|
||||
An important note is that normal and specular maps influence the diffuse map
|
||||
declared before them, so materials like this are possible:
|
||||
|
||||
textures/terrain/grass
|
||||
{
|
||||
qer_editorimage textures/terrain/grass.jpg
|
||||
|
||||
{
|
||||
map textures/terrain/rock.jpg
|
||||
}
|
||||
{
|
||||
stage normalparallaxmap
|
||||
map textures/terrain/rock_n.png
|
||||
}
|
||||
{
|
||||
stage specularmap
|
||||
map textures/terrain/rock_s.jpg
|
||||
}
|
||||
{
|
||||
map textures/terrain/grass.jpg
|
||||
blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
|
||||
alphaGen vertex
|
||||
}
|
||||
{
|
||||
stage normalparallaxmap
|
||||
map textures/terrain/grass_n.png
|
||||
}
|
||||
{
|
||||
stage specularmap
|
||||
map textures/terrain/grass_s.png
|
||||
specularReflectance 0.12
|
||||
}
|
||||
{
|
||||
map $lightmap
|
||||
blendfunc GL_DST_COLOR GL_ZERO
|
||||
}
|
||||
}
|
||||
|
||||
Though note due to the complexity of lighting, dynamic light (including
|
||||
sunlight with cascaded shadow maps) currently only works 100% on materials like
|
||||
this, where the second diffuse map doesn't have its own alpha, and only
|
||||
uses vertex alpha. YMMV.
|
||||
|
||||
Another addition to materials is working normal/specular maps on vertex lit
|
||||
surfaces. To enable this, make your material look like this:
|
||||
|
||||
textures/vehicles/car
|
||||
{
|
||||
qer_editorimage textures/vehicles/car.jpg
|
||||
|
||||
{
|
||||
map textures/vehicles/car.jpg
|
||||
rgbGen vertexLit
|
||||
}
|
||||
{
|
||||
stage normalparallaxmap
|
||||
map textures/vehicles/car_n.jpg
|
||||
}
|
||||
{
|
||||
stage specularmap
|
||||
map textures/vehicles/car_s.jpg
|
||||
}
|
||||
}
|
||||
|
||||
Note the new keyword, 'vertexLit' after rgbGen. This is analogous to
|
||||
'rgbGen vertex', except a light direction will be determined from the lightgrid
|
||||
and used with the normal and specular maps. 'exactVertexLit' exists as well,
|
||||
and is the equivalent for 'exactVertex'.
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
DYNAMIC SUNLIGHT AND CASCADED SHADOW MAPS
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
This adds a new keyword to sky materials, q3gl2_sun. The syntax is:
|
||||
|
||||
q3gl2_sun <red> <green> <blue> <intensity> <degrees> <elevation>
|
||||
<mapLightScale> <ambientLightScale>
|
||||
|
||||
Note the first six parameters are the same as in q3map_sun or q3map_sunExt,
|
||||
and the last two indicate scaling factors for the map brightness and an ambient
|
||||
light of the same color as the sun.
|
||||
|
||||
There are currently two ways to use this in your own (and other people's) maps.
|
||||
|
||||
1. Create your map as normal, set r_sunlightMode to 1, and add a
|
||||
'q3gl2_sun' line after your 'q3map_sun' line in your sky material, like
|
||||
so:
|
||||
|
||||
textures/skies/bluesky
|
||||
{
|
||||
qer_editorimage textures/skies/bluesky.jpg
|
||||
|
||||
surfaceparm nomarks
|
||||
surfaceparm noimpact
|
||||
surfaceparm nolightmap
|
||||
surfaceparm sky
|
||||
q3map_sunExt 240 238 200 100 195 35 3 16
|
||||
q3gl2_sun 240 238 200 50 195 35 1.0 0.2
|
||||
q3map_skylight 50 16
|
||||
q3map_lightimage $whiteimage
|
||||
|
||||
skyparms env/bluesky - -
|
||||
}
|
||||
|
||||
The advantages with this method are that your map will continue to work
|
||||
with the old renderer with the sunlight baked into the lightmap, and it
|
||||
can be used with existing maps without recompilation. The downside is
|
||||
artifacts like doubled shadows and uneven shadow edges.
|
||||
|
||||
2. Set r_sunlightMode to 2 and use 'q3gl2_sun' instead of 'q3map_sun' or
|
||||
'q3map_sunExt', like so:
|
||||
|
||||
textures/skies/bluesky
|
||||
{
|
||||
qer_editorimage textures/skies/bluesky.jpg
|
||||
|
||||
surfaceparm nomarks
|
||||
surfaceparm noimpact
|
||||
surfaceparm nolightmap
|
||||
surfaceparm sky
|
||||
q3gl2_sun 240 238 200 50 195 35 0.5 0.2
|
||||
q3map_skylight 50 16
|
||||
q3map_lightimage $whiteimage
|
||||
|
||||
skyparms env/bluesky - -
|
||||
}
|
||||
|
||||
The advantages with this method are that you don't get the artifacts that
|
||||
characterize the other method, and your map compiles a lot faster without
|
||||
the sunlight bouncing calculations. The downsides are that your map will
|
||||
not display properly with the old renderer, and you lose the bounced light
|
||||
that compiling the map with q3map_sun* in it would have.
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
TONE MAPPING AND AUTO EXPOSURE
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
This adds a new keyword to sky materials, q3gl2_tonemap. The syntax is:
|
||||
|
||||
q3gl2_tonemap <toneMapMin> <toneMapAvg> <toneMapMax <autoExposureMin>
|
||||
<autoExposureMax>
|
||||
|
||||
Each of these settings corresponds to a matching cvar, so you can view and
|
||||
adjust the effect before settling on fixed settings.
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
THANKS
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
I'd like to take this part of the readme to thank the numerous people who
|
||||
contributed thoughts, ideas, and whole swaths of code to this project.
|
||||
|
||||
- Id Software, for creating Quake 3 and releasing its source code under a
|
||||
GPL license, without which this project would not be possible.
|
||||
|
||||
- Zachary 'Zakk' Slater, Thilo Schulz, Tim Angus, and the rest of the
|
||||
ioquake3 team and contributors, for improving massively upon the raw Quake
|
||||
3 source, and accepting my and gimhael's modular renderer patch.
|
||||
|
||||
- Robert 'Tr3B' Beckebans and the other contributors to XReaL, for letting me
|
||||
liberally copy code from you. :)
|
||||
|
||||
- Andrew 'Black Monk' Prosnik, Andrei 'Makro' Drexler, Tomi 'T.T.I.' Isoaho,
|
||||
Richard 'JBravo' Allen, Walter 'Johnny Rocket' Somol, and the rest of the
|
||||
Boomstick Studios, for contributing code, feature requests, and testing.
|
||||
|
||||
- Yoshiharu Gotanda, Tatsuya Shoji, and the rest of tri-Ace's R&D Department,
|
||||
for creating the tri-Ace shading equations and posting their derivations in
|
||||
simple English.
|
||||
|
||||
- Matthias 'gimhael' Bentrup, for random ideas and bits of code.
|
||||
|
||||
- Evan 'megatog615' Goers, for testing, ideas, and bugging me just enough
|
||||
that I'd write documentation. :)
|
||||
|
||||
- The folks at #ioquake3, who don't seem to mind when I suddenly drop a
|
||||
screenshot and insist on talking about it. :)
|
||||
|
||||
- And lots of various other random people, who posted on forums, blogs, and
|
||||
Wikipedia, who helped in small but numerous ways.
|
||||
|
||||
If I missed you in this section, feel free to drop me a line and I'll add you.
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
CONTACT
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
My name is James Canete, and I wrote most of this readme. Also, a renderer.
|
||||
|
||||
If you wish to get in touch with me, try my GMail at use.less01 (you should be
|
||||
able to solve this), or look for SmileTheory in #ioquake3 on irc.freenode.net.
|
||||
Loading…
Add table
Add a link
Reference in a new issue