I’m using Xith3d to render a physical simulation and was wondering if it is possible with Xith or even with the openGL underpinnings to do motion blur with my objects?
I haven’t seen it mentioned in the forums before.
Thanks.
do u mean ‘motion blur’ or ‘fading trails’ (just to be clear).
I’m not totally sure, but I want the blur to be proportional with velocity of the object, so I’m guessing that’s motion blur rather than just trails right?
Thanks.
I heard that maybe true motion blur is quite hard to do, so if you’re implying that maybe this fading trails is a good alternative than I’m interested, any tips on how to do this in Xith or OpenGL would be greatly appreciated.
Thanks.
well trails is a simple one- the thing to find out mind it how to turn off the clearing of the view when render() is called.
next is a simple hack: but a transparent plain infrount of the camera. the more transparent the more trails u get. the transparent plain will be clearing the screen.
magic 
the other way is to use an accumilation buffer- but this can be slow one some computer. what this duss is calls a draw a given number of times. it nicer if u have the 3d card. because it clears the buffers very nicely indeed.
hope that helps
If you are evaluating fading trails, a good production example that I have seen is GTA3 (where they partially use it to disguise low-poly models). Not always the cleanest of effects however.
Although, I imagine that true motion blur would be very computationally expensive (as well as being hard to do).
Will.
You can find Motion Blur example that uses Accumulation Buffer at http://www.sulaco.co.za/opengl.htm (this is OpenGL example).
Yuri