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Preview performance is very slow when using render warps
#1
I have a very simple, low res scene with some smoke being emitted by and object source.

Grid size is 135 x 125 x 150 with a spacing of 1, which sims up to 112MB.

I can play this back in realtime in the viewport and preview window, but performance drops greatly when I apply a render warp. I'm using a simple 4x4x4 FFD.

Each frame takes about 3 seconds to be displayed. This is the same for GPU and non GPU preview, and viewport display, even when the display setting is reduced to minimal settings.

As soon as I disable the render warp in the fume dialogue, performance returns to normal.

I'm using Fume 3.5.1

The performance hit is so great, I wanted to check that this is normal.
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#2
Hello Hugh,

That is normal as FumeFX has to pass millions of points to FFD to be transformed.
Bend and Twist are a bit faster (depending on parameters).

Regards,

Kresimir Tkalcec
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