Autodesk 12812-051462-9011 User Guide 3 - Page 985

Materials The mental ray renderer does not support these materials: ■ Advanced Lighting Override material ■ Lightscape material ■ Morpher material Raytrace Material The mental ray renderer supports all Raytrace material settings except for the antialiasing parameters and the settings found under Rendering > Raytracer Settings and Rendering > Raytrace Global Include/Exclude. All these options are specific to the default scanline renderer. TIP While the mental ray renderer ignores the global inclusion or exclusion settings for the ray tracer, you can enable or disable ray-tracing at the local level of a Raytrace material or map. Maps ■ Bitmap The mental ray renderer can't use the Progressive JPEG (.jpg) format as a bitmap. Also, Summed Area filtering is not supported (in the Filtering group of the Bitmap Parameters rollout). PSD files are supported, but are translated into binary data, and because of this, consume a lot of memory and increase render time. To reduce the time involved, convert the PSD file to a format such as BMP. The same is true of TIFF files. In addition, there are certain TIFF subformats that the mental ray renderer does not support; specifically, LZW, CCIT (fax), or JPEG compression; non-RGB color models such as CMYK, CIE, or YCbCr; or multiple images in the same file (in this case, only the first image is used). The mental ray renderer does support bilevel (1-bit), grayscale (4or 8-bit), color map (4- or 8-bits), RGB(A) (8-, 16-, or 32-bit) TIF images, and TIF files with image strips. ■ Combustion map The mental ray renderer doesn't support this map. ■ Flat Mirror map Flat Mirror is supported by the mental ray renderer, except for the First Frame Only and Every Nth Frame parameters. 6240 | Chapter 20 Rendering