Rotating individual point sprites

I am using point sprites to render a snow particle system. It
would be nice to be able to rotate each individual point sprite around
the Z-axis,X-axis or Y-axis , to give the illusion of using more than one texture.

Looking through the docs, there doesn't seem to be any support for
this. Has anyone found a workaround, like maybe rotating the view
matrix per particle That would pretty much wipe out any bandwidth
benefit from using point sprites though...

How to rotate the texture for each particle sprite quickly

Answer this question

Rotating individual point sprites

Bufuro
could you tell me where can find the sample

Which sample The example I mentioned at the end of my previous post isn't something you can download unfortunately.

You could try searching the GameDev.net forums as I'm pretty sure I've seen this (and similar) methods discussed there.

hth
Jack
paksys
thanks

but ,could you tell me where can find the sample
Bart Vercauteren

I'm pretty sure you can't do what you want using the built in point sprite system. The texture coordinates (and additional vertices) are defined by the pipeline and not the application.

One system that I've seen used to good effect is to divide your particle system a number of batches (e.g. of 1000 particles each) and swap textures between them. That way you introduce a bit of variety without hurting your code or performance too much.

hth
Jack
Rotating individual point sprites

Answer this question