I read the specular rotation description of arnold manual.(https://support.solidangle.com/display/A5AFMUG/Specular)
"It is possible to assign textures to the specular rotation. When doing so, it is advisable to avoid texture filtering. "
The manual explanation is not clear enough.
how can i avoid texture filtering?
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The sentence after that reads:
"This means disabling MIP-mapping and disabling the magnification filter, which by default is set to "smart bicubic." One way is to set the mipmap_bias of the image node to a strong negative value, like -8, which means "use 8 MIP levels higher resolution than usual"."
This can be found in the Arnold attributes of the Maya file node.
I think that disabling MIP-mapping is to to set the mipmap_bias of the image node to a strong negative value, like -8.
but, how is to disabling the magnification filter?
what type of the Filter Type must selected?
closest. but really for this kind of stuff you better get it by testing it directly with the renderer. keep AA settings low.. attach a file texture to a flat material.. set mip bias to -8 and switch between closest and any 'bi'xxx filter.. you'll see in an instant what filters your texture and what not.
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