math - Orbit around arbitrary axis glsl -


i animating simple circular orbit around central object using glsl. 2d orbit simple enough, when try object orbiting in other axis becomes more complicated. 

float xval = (radius) * sin(timevalue); float yval = (radius) * cos(timevalue); float zval = 0.; 

// n=(nx,ny,nz) rotation axis, if not normalized, use  norm = sqrt(nx*nx+ny*ny+nz*nz) nx /= norm; ny /= norm; nz /= norm  // phi current rotation angle  c=cos(phi); s=sin(phi);  // rotation simple quaternions  q = quaternion(c, s*nx, s*ny, s*nz)  rotated_vec = q.rotate(vec)

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