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Autocad Render Preferences Command

Yazı Ocak 28th, 2010 Yorum(0) Print

Controls rendering options. This dialog box is available when Photo Raytrace is selected as the Rendering Type and you choose More Options under Rendering Options in the Rendering Preferences dialog box.

Anti-Aliasing

Controls the level of anti-aliasing used in rendering.

Minimal

Renders with analytical horizontal anti-aliasing only.

Low

Renders with analytical horizontal anti-aliasing and four multiple shading samples per pixel. The more samples per pixel, the more time it takes to render the image.

Medium

Renders with analytical horizontal anti-aliasing and nine multiple shading samples per pixel. The more samples per pixel, the more time it takes to render the image.

High

Renders with analytical horizontal anti-aliasing and 16 multiple shading samples per pixel. The more samples per pixel, the more time it takes to render the image.

Adaptive Sampling

Accelerates the anti-aliasing process within the bounds of the sample matrix size. Given a contrast threshold that you supply, AutoCAD judges whether it can process fewer samples than specified for the matrix and still get adequate results.

Enable

Turns on adaptive sampling.

Contrast Threshold

Sets the sensitivity of adaptive sampling. With a low threshold, small differences between the initial sample values force more samples to be taken. At a higher threshold, the sample value differences must be greater to force more sampling. This increases rendering speed at the expense of image quality. You can specify a value between 0.0 and 1.0.

Ray Tree Depth

Controls the ray tree.

Maximum Depth

Defines the depth of the tree used by the Photo Raytrace renderer to track reflected and refracted (transmitted) rays. The default value is 3. Greater values give more accuracy but increase rendering time—it is recommended that you not use a maximum depth greater than 10.

Cutoff Threshold

Defines a threshold for how much a further ray trace must contribute to the final pixel value to continue. For example, a value of 0.03 means that the next bounce must contribute at least 3 percent to the final pixel or the ray tree will be pruned at this point. Values between 0.0 and 1.0 are valid. With this feature, you can refine the trade-off between speed and image quality.

Face Controls

Controls how RENDER treats the faces of 3D solid objects.

Discard Back Faces

Prevents AutoCAD from reading the back faces of a 3D solid object when performing calculations for a rendering (for hidden faces only). This setting does not eliminate back faces; it only makes them invisible and speeds up the rendering process.

Back Face Normal Is Negative

Controls which faces AutoCAD considers back faces in a drawing. In a right-hand coordinate system like AutoCAD, when you draw a 3D face and enter the vertices in a counterclockwise direction, a positive normal vector points outward toward the viewer and identifies the face as a front face. The back face is identified by a negative normal vector that points away from the viewer.

Clearing this option reverses which faces AutoCAD considers back faces. If Discard Back Faces is selected, AutoCAD recognizes the faces with negative normal vectors as back faces and discards them.

Depth Map Shadow Controls

Adjusts the shadow map bias, which moves a shadow relative to the shadow-casting object to prevent self-shadowing or detached shadows.

Minimum Bias

Sets the lowest value in the range. The default is 2.0. The valid range of values depends on the scene to render, but it should usually be between 2.0 and 20.0.

Maximum Bias

Sets the highest value in the range. The default is 4.0. This value should be no more than 10.0 greater than the minimum bias value.

Texture Map Sampling

Sets the method of sampling a texture map when it’s projected onto an object smaller than itself.

Point Sample

Selects the nearest pixel within the bitmap.

Linear Sample

Averages the four pixels nearest to the sample point within the bitmap.

Mip Map Sample

Averages bitmap pixels using the mip method—a pyramidal average based on square sample areas.


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