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Add small helper to t3d skeleton that returns a bones model space position #57

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Merged
HailToDodongo merged 2 commits into from
Dec 5, 2025
Merged

Add small helper to t3d skeleton that returns a bones model space position #57

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06a35ff
add helper to get bone position in model space
Byterset Dec 5, 2025
c2cdbf2
Merge branch 'HailToDodongo:main' into main
Byterset Dec 5, 2025
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20 changes: 20 additions & 0 deletions src/t3d/t3dskeleton.h
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,26 @@ void t3d_skeleton_destroy(T3DSkeleton* skeleton);
*/
int t3d_skeleton_find_bone(T3DSkeleton* skeleton, const char* name);

/**
* Gets the position in model space of the bone with the given index from its matrix.
* This assumes the bone matrix has been updated beforehand with t3d_skeleton_update.
* @param skeleton The skeleton containing the bone
* @param boneIdx Index of the bone
* @return The T3DVec3 position of the bone in model space
*/
static inline T3DVec3 t3d_skeleton_get_bone_pos_model_space(const T3DSkeleton *skeleton, int boneIdx){
assertf(boneIdx >= 0 && boneIdx < skeleton->skeletonRef->boneCount, "Bone index is out of bounds, idx: %i, boneCount: %i", boneIdx, skeleton->skeletonRef->boneCount);
// Access the bone at the given index
const T3DBone *bone = &skeleton->bones[boneIdx];

// Extract the position from the matrix.
return (T3DVec3) {{
bone->matrix.m[3][0],
bone->matrix.m[3][1],
bone->matrix.m[3][2]
}};
}

/**
* Draws a skinned model with default settings.
* Alternatively, use 't3d_model_draw_custom' and set 'matrices' in the config.
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