Hi !
I wanted to add some animation to my instanced particles engine, but it seems I cannot have both: particles facing camera, and particle rotating around its center.
The particles don’t have a world matrix, I only use posVP to draw them.
Do they need a world matrix to make them rotate around the vector facing the cam ?
I have tried so many things I’m a little lost. The only thing almost normal I achieved is the particles rotating around the emitter position, that’s when I started wondering about a worldmatrix.
I found this: https://en.wikipedia.org/wiki/Rodrigues'_rotation_formula but before I start with this…
Is there a (simple) solution to rotate the quad after the posVP (screenspace) around its own center ? (which is known: the current corner processed, and the 3D center position of the particle)