Particles in Geo Instancing not rotating correctly

Hello all!

I am trying to rotate particles (quads) with Geo Instancing so they always face to the camera. Im doing the same method used in gpuParticles, where the Camera matrix is taken and rotations are computed in glsl TOP. It works for most of the particles, but for some not and I don’t know why. Here I share a tox with an exr image with the xyz positions of the particles Im dealing with (recorded with kinect).

Thanks you all in advance!

Joan (25.7 KB)