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TobyGaines

Mipmapping - smaller tiles actually render slower?

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Hi guys - 
In the Texture node ( with a mipmapped exr in it ) if I increase the Filter Width, any object reflecting the texture renders much slower. I guess changing the Filter width is actually running a blur filter on the entire texture map, instead of using a smaller tile - ?

Is there any way to force it to trace just a lower-res tile?

Thanks!

Toby

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Somer renders to illustrate - the ground is a chrome shader, the background is a dome ( geo ) with the texture on it.

Filtering @ 1.0, render time is 14 sec.

Filtering @ 40.0, render time is 5 times longer ( when it should be faster ) 66 sec.

 

Screen Shot 2017-12-21 at 11.39.32 PM.png

Screen Shot 2017-12-21 at 11.38.22 PM.png

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5 hours ago, TobyGaines said:

Is there any way to force it to trace just a lower-res tile?

Yes. Use RAT texture. Mantra doesn't use tilling nor mipmapping in EXR format (even if file itself is tiled and mipmapped). 

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Ok great, thanks - but I thought it was converting it anyway? Is there a tool to do the conversion beforehand? Googling -

 

booyah! icp fixed everything, renders in 12sec now, thanks!

 

 

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