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Fix rendering IQM models between model frames

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For lerped frames (refEntity_t frame not equal oldframe) IQM joint
matrices may have incorrect axis scale. This can cause significant model
distortion. The matrix lerp is linear causing each vector to move in a
straight line between frames instead of arcing like a circle. Each joint
frame can have a different scale so can't just normalize the joint
matrix.

Store joints as quaternions and spherical lerp between them and then
convert to a matrix. For my test model, setting up the skeleton is four
times slower now but it still seems to be fast enough to be usable.
This commit is contained in:
Zack Middleton 2019-04-29 14:39:10 -05:00
parent d13d06424e
commit d404519cce
5 changed files with 294 additions and 164 deletions
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4
code/qcommon/q_shared.h
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@ -368,6 +368,8 @@ typedef vec_t vec3_t[3];
typedef vec_t vec4_t[4];
typedef vec_t vec5_t[5];
typedef vec_t quat_t[4];
typedef int fixed4_t;
typedef int fixed8_t;
typedef int fixed16_t;
@ -578,6 +580,8 @@ typedef struct {
#define Byte4Copy(a,b) ((b)[0]=(a)[0],(b)[1]=(a)[1],(b)[2]=(a)[2],(b)[3]=(a)[3])
#define QuatCopy(a,b) ((b)[0]=(a)[0],(b)[1]=(a)[1],(b)[2]=(a)[2],(b)[3]=(a)[3])
#define SnapVector(v) {v[0]=((int)(v[0]));v[1]=((int)(v[1]));v[2]=((int)(v[2]));}
// just in case you don't want to use the macros
vec_t _DotProduct( const vec3_t v1, const vec3_t v2 );