This was due to the fact the drawing code was expecting the editpoints to be equaly spaced. Reuse the code in particle.c to output the select mask in red color channel of the particle (which is unused in new code).
This was due to the fact the drawing code was expecting the editpoints to be equaly spaced. Reuse the code in particle.c to output the select mask in red color channel of the particle (which is unused in new code).