void MSmodel::rotatebone(int bonei, float angle, float xAxis, float yAxis, float zAxis){
int i,l,b; // looping vars
float cosTheta = (float)cos(angle);
float sinTheta = (float)sin(angle);
CPoint vNewPos;
CPoint vPos;
for(i=0; i<meshes; i++){
for(l=0; l<mesh.numverts; l++){
for(b=0; b<mesh.vert[l].owners.size(); b++){
if(mesh.vert[l].owners == bonei){
vPos = mesh.vert[l].pos - bone[bonei].pos;
vNewPos.x = (cosTheta + (1 - cosTheta) * xAxis * xAxis) * vPos.x;
vNewPos.x += ((1 - cosTheta) * xAxis * yAxis - zAxis * sinTheta) * vPos.y;
vNewPos.x += ((1 - cosTheta) * xAxis * zAxis + yAxis * sinTheta) * vPos.z;
vNewPos.y = ((1 - cosTheta) * xAxis * yAxis + zAxis * sinTheta) * vPos.x;
vNewPos.y += (cosTheta + (1 - cosTheta) * yAxis * yAxis) * vPos.y;
vNewPos.y += ((1 - cosTheta) * yAxis * zAxis - xAxis * sinTheta) * vPos.z;
vNewPos.z = ((1 - cosTheta) * xAxis * zAxis - yAxis * sinTheta) * vPos.x;
vNewPos.z += ((1 - cosTheta) * yAxis * zAxis + xAxis * sinTheta) * vPos.y;
vNewPos.z += (cosTheta + (1 - cosTheta) * zAxis * zAxis) * vPos.z;
mesh.vert[l].pos = bone[bonei].pos + vNewPos;
}
}
}
}
}
Rotation not working correctly in skeletal animation
Author
last night i started adding skeletal animation to my MilkShape model class (only joint rotation for now). well, it works except for the fact that the verticies are moving out from the bone and back in, as if they were rotating around a point a slight distance away from the bone.
ill post the code i wrote as well as a variable explanation
type CPoint is in most basic terms a class that holds x,y, and z values
mesh is an array of structs of all meshes
vert is an array of structs of all verticies and is declared by mesh
bone is an array of structs of all joints
pos (in both bone and vert) is a CPoint of its current location
owners is a vector of the indicies of all the bones that control the selected vertex
if anyone can tell me what im doing wrong, or a suggested improvement about how i am doing things, please reply, thank you.
It looks like you are pivoting on the wrong point. At frame zero does everything look ok, and then a few rotation frames later everything appears disjoined?
This topic is closed to new replies.
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