RenderWorks Features for OpenGL
If RenderWorks is installed, the OpenGL render mode has additional features that help you to preview and adjust a scene before it is rendered with RenderWorks.
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Turn on the Draw Edges feature to outline objects more clearly in the rendered drawing; these edges are similar to those in the Hidden Line render mode. (See OpenGL Render Options for details.)
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Turn on the interactive Use Shadows feature to see how the shadows fall with different types of lighting. The shadows render much faster than they do with RenderWorks, which makes it easier to adjust the lights quickly. (See OpenGL Render Options for details.)
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Rendering with RenderWorks : RenderWorks Features for OpenGL

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