Additional V-Ray attributes can be added to texture(s) to specify additional properties through the Attributes > VRay menu of the Attribute Editor while the texture is selected.
This group of attributes can be added to File and Substance textures to control their filtering.
Override Texture Filter – Override the default texture filter that V-Ray chooses based on the Maya attributes of the particular texture node. For more details, please see the V-Ray Filter Interpretationtable below.
Texture Filter – The V-Ray internal texture filter.
Nearest – The nearest texel from the map is taken, without any interpolation. Smooth – The colors are computed with bilinear interpolation from the texels. Smooth with mipmaps – Pyramidal MIP map filtering is used to compute the texture color. SAT – A summed area table is used to compute the texture color. Elliptical – High quality anisotropic MIP map texture filtering that reduces blurring and aliasing artifacts. Sharp mip-map filtering – Sharper and more accurate version of the Smooth with mipmaps. Produces results that are closer to the results with disabled filtering but with less AA samples required.
Smooth Method – The V-Ray internal texture smooth method.
Bilinear – The image values are interpolated from four pixels in the bitmap. This is the fastest interpolation method, but the result is not continuous (non-smooth) and may produce artifacts when the map is used for displacement or bump mapping. Bicubic – The image values are interpolated from sixteen pixels in the bitmap. This is the slowest method, but the results are smooth without too much blur. Biquadratic – The image values are interpolated from nine pixels in the bitmap. This method is faster than the Bicubic interpolation, but may smooth the image too much.
For example, if a File node is used and Override Texture Filter is off or not added, V-Ray looks at the Maya Filter Type attribute. Here's how V-Ray translates the Maya filters to V-Ray filters:
Maya Filter Type
V-Ray Filter
Support for tiled images
Off
Smooth
Uses tiles only from the largest mipmap level
Mipmap, Box, Quadratic
Sharp mip-map filtering
Supports tiled mipmapped images
Quartic, Gaussian
SAT
Loads the whole image in memory like a normal scanline image
Column
width
5%
Column
width
33%
Texture Filter Blur
...
Section
Column
width
62%
This attribute group can be added to File nodes only. This is V-Ray's native filter blur without any other filter blur calculations.
Filter Blur – Specifies the level of filter blurring of the texture. A value of 0 means no filtering and higher values result in blurrier filtering.
