AttachBonePositionTrackModifier.c

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class AttachBonePositionTrackModifier : CinematicTrackModifier
{
    [Attribute(defvalue:"", desc:"Entity we want be attached to")]
    string entityToAttach;
    
    [Attribute(defvalue:"", desc:"Bone we want be attached to")]
    string boneToAttach;
    
    [Attribute(defvalue:"false", desc:"If we want to rotate with parent")]
    bool applyRotation;
    
    vector transform[4];
    vector boneTransform[4];
    vector originalVector[4];
    ChimeraWorld chimeraWorld;
    
    override void OnInit(World world)
    {
        chimeraWorld = world;
    }
    
    override vector OnApplyModifierVector(float time, vector originalValue)
    {
        
        IEntity entity =  chimeraWorld.FindEntityByName(entityToAttach);
        
        if (!entity)
            return originalValue;
        
        entity.GetTransform(transform);
        
        if (boneToAttach != "") //attach to bone
        {
            Animation entityAnimation = entity.GetAnimation();
            
            if (!entityAnimation)
                return originalValue;
            
            TNodeId boneId = entityAnimation.GetBoneIndex(boneToAttach);
            
            if (boneId == -1)
                return originalValue;
            
            entityAnimation.GetBoneMatrix(boneId, boneTransform);
            Math3D.MatrixMultiply4(transform, boneTransform, transform);
            
            if (applyRotation)
            {
                originalVector = { "1 0 0", "0 1 0", "0 0 1", originalValue};
                Math3D.MatrixMultiply4(transform, originalVector, transform);
                
                return transform[3];
            }
            else
            {
                return transform[3] + originalValue;
            }
        }
        
        return originalValue;
    }
};