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Velocity Motion Blur Questions


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Hi all.

I have just rendered a smoke/fire effect using a smoke like shader with particles rendered as sphere primitives.

The render obviously has many transparent sufaces, to get the right effect i have to use motion blur. I choose velocity motion inherited from the particles.

With motion blur the render times incraese a lot.

Can anybody explian me how velocity motion blur works? and if anybody, based in his/her experience, could advise me about how to optimize render times for motion blurred sprites/spheres(many transparent surfaces with a fast movement) etc ...

Thanks

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