The iray renderer ignores settings on the Noise rollout for any other map type. Renders a bit differently than with the Scanline or mental ray renderers. On the Bitmap Parameters rollout, the iray renderer ignores the Filtering, Mono Channel Output, RGB Channel Output, and Alpha Source settings. The iray renderer ignores the Blur / Blur Offset settings. The Map Channel value must be in the range 1 to 4. The iray renderer supports the Explicit Map Channel, Planar From Object XYZ, and Planar From World XYZ mappings. On the Coordinates rollout for a Bitmap, the coordinate type must be set to Texture.
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Run each test until the image is free of graininess. Time permitting, run test renderings with and without Sky Portals, to compare the image quality and the render time.
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The version of iray provided with 3ds Max is iray v2.1.
The complexity of materials in the scene also affects performance: The more textures, blending, and noise a material has, the longer it takes to calculate the results. As with other renderers, performance is also proportional to the resolution of the rendered image. The complexity of light paths is more important: A candle in a labyrinth, or light rays diverging from a narrow window, will take longer to yield a good-quality rendering than light shining through a broad skylight or picture windows. The performance of a ray-tracing renderer such as the iray renderer is relatively independent of how complex the scene geometry is. If textures (usually shared among face triangles) can also fit into GPU memory, that improves rendering performance as well. However, the result is not the same as hardware viewport shading: The computation carried out by the iray renderer is physically correct, and the result of a hardware-assisted iray rendering is the same as the result when you render using the Central Processing Unit (CPU) only.Ī rule of thumb for GPU usage is that one gigabyte (GB) of memory can store 5 to 10 million triangles (5–10M) of geometry. The same scene after an extended rendering timeĪ graphics card with a CUDA-enabled Graphics Processing Unit (GPU) will improve the performance of the iray renderer (CUDA stand for Compute Unified Device Architecture).