Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: wilbertvandenbroek on 2020-02-11, 13:44:55

Title: Scaling a Corona volume grid increases rendertime exponentially?
Post by: wilbertvandenbroek on 2020-02-11, 13:44:55

Is this a bug or behaviour that I need to be aware of?
When I import a vdb cache I need to scale my volume grid to match my scene size.
Rendertimes then increase exponentially to a point where you can't render at all.

I can fix this by adjusting the step size. Is this the right workflow or am I working around a bug?

Title: Re: Scaling a Corona volume grid increases rendertime exponentially?
Post by: romullus on 2020-02-11, 16:09:15

I believe this is normal. When you scale up VDB object, step size remains the same and since it's expressed in world units, not in percentage, that means much more complex calculation for Corona. Increasing step size is correct solution.

Title: Re: Scaling a Corona volume grid increases rendertime exponentially?
Post by: wilbertvandenbroek on 2020-02-11, 16:18:05

Ok thanks for the fast reply. My smoke plumes are coming along nicely now :-)