Autodesk 12812-051462-9011 User Guide 3 - Page 1070

Sampling Rate When chosen, renders an image that shows where samples were collected during rendering; see Sampling (mental ray Renderer) on page 8112. This can help you adjust the contrast and other sampling parameters. Coordinate Space Renders an image that shows the coordinate space of objects, the world, or camera. ■ Object Shows local coordinates (UVW). Each object has its own coordinate space. ■ World Shows world coordinates (XYZ). The same coordinate system applies to all objects. ■ Camera Shows camera coordinates, which appear as a rectangular grid superimposed on the view. Size Sets the size of the grid. Default=1.0. TIP To avoid busy moiré patterns in the grid, increase the value of Size. Photon Renders the effect of a photon map in the screen. This requires that a photon map be present (to render caustics or global illumination). If no photon map is present, the Photon rendering looks just like the nondiagnostic rendering of the scene: the mental ray renderer first renders the shaded scene, then replaces it with the pseudocolor image. ■ Density Renders the photon map as it is projected into the scene. High density is displayed in red, and lower values render in increasingly cooler colors. ■ Irradiance Similar to the Density rendering, but shades the photons based on their irradiance. The maximum irradiance is rendered in red, and lower values render in increasingly cooler colors. BSP Renders a visualization of the parameters used by the tree in the BSP ray-trace acceleration method on page 6282. If a message from the renderer reports excessively large depth or size values, or if rendering seems unusually slow, this can help you locate the problem. ■ Depth Shows the depth of the tree, with top faces in bright red, and increasingly deep faces in increasingly cool colors. ■ Size Shows the size of leaves in the tree, with differently sized leaves indicated by different colors. NOTE The BSP diagnostic works with the BSP method only; the BSP2 method does not support it. mental ray Renderer | 6325