I created a tiny utility that sets the weights of vertices that are in the field of view of the camera. May come in handy if you want to restrict the distribution of particles for example. Details and download instructions in this article.
@Ray Tracer: the reflected weights are clearly a bug: i probably forgot to check if the point of intersection with the view frame was negative. I am pretty sure all my testcases were with the camera outside the plane being weighted, so thank you for reporting it!
The bald spot i don’t understand, i don’t think it has to do with the clipping distance (because i do not take that into account) but it might be a precision issue. Can you post the .blend somewhere? (or just tell me what the dimension of the plane and the positions of the plane and the camera are ?
I fixedthe reflected weights.The bald spot is not a bug: from the camera view some vertices ‘near your feet’ are in fact not visible, so if you look from the top there is an area around the camera position that is indeed not weighted (To verify this behaviour: if you increase the field of view of the camera, i.e. decrease its focal lenght, this bald spot will be smaller).