For task instructions, see Extract an ambient occlusion map.
Expand the following headings to find descriptions of each area in the Extract Texture Maps window.
Target Models Displays the name of the model to receive the extracted map. The map produced will represent the difference between this model (low resolution) and the source model(s) (high resolution).
The target model is usually the lowest subdivision level of a model with multiple subdivision levels. You can click the displayed subdivision level (next to the target model name) to select a different subdivision level from a drop-down list.
Use the Add All, Add Selected, and Remove buttons to change the model listed as the target.
Smooths the positions of interior UVs of the target model during the texture extraction. Smooth Target UVs only smooths when the Smooth Target Model option is on.
This can be useful if your image rendering software (for example, Pixar’s RenderMan®) can smooth the UV texture coordinates on a mesh during rendering to improve the results.
For target models with creasing or hard edge data (see Import and export objects with creasing and hard edges), lets you set how Mudbox handles the creasing information when extracting texture maps.
When on, Use Creases & Hard Edges affects the operation of other map extraction options. If you are smoothing your target mesh (Smooth Target Models is on), it ensures that the creases are maintained in the smoothed mesh. If you are using Ray Casting, it ensures that vertex normals are used to map the surface together (rather than face normals). If you are creating a normal map, it ensures that the local tangent space calculation takes the creases and edges into account, rather than interpolating smoothly over the model.
Source Models Lists the model(s) to extract maps from. The source model (high resolution) typically contains the sculpted details to be extracted into the map(s). This model does not require UV texture coordinates.
You can click the displayed subdivision level (next to the source model name) to select a different subdivision level from a drop-down list. Use the Add All, Add Selected, and Remove buttons to change the model listed as the source
Output MapDetermines the quality of the final ambient occlusion map based on multiple shadow maps used for the calculation. Preset values include: Fastest, Fast, Normal, Good, and Best. A higher quality setting increases the number of shadow maps, produces a higher quality map, and increases the time to generate the ambient occlusion map.
Extracts a texture map by recording the distance (as a pixel value) between the source and target models based on sample rays cast along the surface normals of the target surface. The number of sample rays cast depends on the texture map resolution.
Use this method when extracting maps between arbitrary meshes (meshes with differing topologies), and ensure that you manually align the models as accurately as possible before extracting. Artifacts in the resulting texture map can sometimes occur (particularly with overhanging features) that require editing afterwards.
Extracts a texture map by recording the distance (as a pixel value) between one subdivision level and the corresponding point at a higher subdivision level on the same model. Use this method only when extracting texture maps between different subdivision levels on the same model.
The resulting texture map will contain fewer artifacts compared to the Ray Casting method, requires no setup or alignment between separate models, and performs the extraction more quickly. However, Subdivision does not capture the height differences as accurately as the Ray Casting method, particularly when vertices on the higher subdivision level have been translated off normal compared to the lower subdivision level, which can occur when using the Grab or Pinch tools.
(For map extraction, available only when Method is set to Ray Casting.) Controls how the extraction process matches points on the target model to points on the source model, and determines which value to record if an extraction sample intersects the high-resolution model more than once.
For example, given a target mesh with a relatively smooth surface (shown in cross-section in blue):
And using a source mesh with a detailed, wavy surface (shown in cross-section in black):
The following sections illustrate the Choose Samples options available.
(For map extraction, available only when Method is set to Ray Casting.) Sets the maximum distance samples can travel from the target model surface in search of a corresponding point on the source model surface. Samples can travel on both sides of the target model based on the Choose Samples option.
The Search Distance is a physical measurement that determines how far Mudbox searches to find sculpted detail on the source model(s). It should be slightly larger than the distance between the maximum absolute displacement between the high resolution (source) mesh and the low resolution (target) mesh. Click Best Guess if you are unsure.
If set too small, some detail will be cut off or flattened in the resulting map. If set too large, the resulting map can have precision errors, leading to jagged edges in the map. You may need to experiment with the Search Distance value and generate several maps to find the best results. See also Troubleshoot texture extraction.
(For map extraction, available only when Method is set to Ray Casting.) Off by default. so that intersections are ignored when the ray intersects a surface that is facing in the opposite direction. When on, Mudbox records ray intersections with source faces that are backfacing. This improves extraction results when a number of intersecting meshes are used as the source model.
Image properties(Available only when you set Map Type to Texture.)
When on, improves the quality of the final extracted image map by applying a filter comparison between pixels in the image. Higher values increase the amount of antialiasing that occurs and the time to extract the image map. For initial test extractions, use a small Image Size value and leave the Antialiasing property turned off until you produce a final image.
AdvancedControls the size of the shadow maps for the occlusion map calculations. Values are preset at 256 x 256, 512 x 512, 1024 x 1024, 2048 x 2048, 4096 x 4096. The shadow maps are not accessible and are discarded after the generation of the occlusion map.
Increasing the Shadow Map Resolution produces a more detailed occlusion map and increases the time to generate it. In general, set the Shadow Map Resolution to the lowest value that produces an occlusion map of acceptable quality. Default is 1024 x 1024.
Controls the contrast between shaded and non-shaded areas in the ambient occlusion map. Decreasing the value reduces contrast, producing more mid-tone gray values in the map. Increasing the value increases contrast, producing tones that are more black and white. The default contrast setting is 0 (neutral contrast) with the lower and upper range of -1 and 1.
Output optionsEnter a name for the extracted map(s). To have Mudbox automatically append the target mesh name to your filename, use the wildcard characters %s.
Click the browse icon 
to set save options (including file format) in the Save As window.
When on (default), Mudbox also saves general data about the mesh (vertex positions, list of faces, and so on) in the output PTEX file. This can be useful if other tools in your pipeline can use this type of PTEX data, for example if you will use a PTEX viewer to inspect the output file. It is recommended that you keep this option on when extracting PTEX files.
Depending on the type of map (or maps) you're generating, lets you specify the bit depth for the extracted Ptex file. (Options include 8 bit integer, 16 bit integer, 16 bit float, or 32 bit float.) The larger the bit depth you select, the higher the precision in the extracted files, and the larger the file size.
Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
