How to render exact amount of particles

[bjoern]

From the chat:
When taking the Example GPU Particle Systems patch and setting the particle count to 5 for example, only 3 particles get rendered.

@tonfilm

This example patch isn’t made for that case, it quantizes the count so that the shader is simpler and optimized for the hardware thread group count

So it’s more for drawing loads of them quickly

If you want an exact amount, you have to remove the quantization and add an if statement in the shader.

If the thread Id is higher than your desired count exit the shader

Removed the quantization and added :

if (id > ParticlesCount)
            return;

Still only 3 get rendered. Modified patch / shaders attached.

ExactParticleAmount.7z (12.5 KB)