OpenGL Options

Use the OpenGL render mode to create good-quality rendering previews that are fast and interactive.

OpenGL renders up to eight lights in a drawing; additional ambient light, directional, point, or spot lights have no effect. Custom, area, and linear lights can be added.

To get the best performance from OpenGL, use a video card that supports hardware-accelerated OpenGL. There are significant compatibility issues with some cards; see vectorworks.net for a list of video cards that are compatible with the Vectorworks program. If a model is too complex to render the design layer successfully, an alert message displays, informing you that the render mode has been switched to wireframe.

The power-saving video settings of some laptops may cause out-of-memory issues or other display issues that can easily be solved by turning off the power-saving video features.

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Use the OpenGL options to control the level of detail in rendered images, which in turn affects the render speed (less detail renders faster). Changes to the OpenGL options prompt immediate re-rendering when in OpenGL render mode.

These settings apply only to the current drawing; they remain in effect in the current drawing until the settings are changed. The current OpenGL settings are saved when you create a template (see Creating Templates).

The OpenGL render mode has features that help you to preview and adjust a scene before it is rendered with Renderworks render modes.

●    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.

●    Turn on the interactive Use Shadows feature to see how the shadows fall with different types of lighting and adjust the lights. When the system hardware and video card are sufficiently powerful, enhanced, highly accurate shadows are used for the OpenGL rendering. This option can be turned off if quality or instability problems are encountered; see Vectorworks Preferences: 3D Tab.

●    OpenGL can display the following types of Renderworks backgrounds: One Color, Two Color, Image, Panoramic Image, and Physical Sky. It cannot display Cloud. (See Creating Renderworks Backgrounds for details.)

●    OpenGL is used during viewing operations such as flyovers and walkthroughs when a Renderworks mode is in effect. OpenGL also previews a rendered scene before a Renderworks render has completed.

For smoother rendering of mesh objects, enable mesh smoothing for the entire document in the document preferences (see Document Preferences: Display Tab) or for selected meshes on the render pane of the Object Info palette (see Applying a Texture to an Object).

To set the OpenGL options:

1. Select View > Rendering > OpenGL Options.

The OpenGL Options dialog box opens.

Click to show/hide the parameters.

Parameter	Description
Detail	Specifies the level of detail for renderings; a low setting renders faster
Use Textures	Renders object textures; this provides better detail and is usually enabled, but it takes longer to render. Some shaders are intended to be used with the Renderworks render modes. In OpenGL mode, you will see an approximation of the shader appearance, which may be different from the appearance in Renderworks render modes.
Use Colors	When selected, renders colors, and textures with colors; deselect to render colors as white
Use Anti-Aliasing	Filters the rendering and reduces pixelated edges; this option is only available if the graphics card supports the feature
Draw Edges	Select to render objects with lines drawn around the edges, similar to the lines in the Hidden Line Render mode. Edges are drawn where objects meet; break up an object into multiple objects if more edges are needed.
Thickness (pixels)	Enter a value between 1-16 pixels for the edge thickness
Crease Angle	If Draw Edges is selected, surfaces that diverge by more than this angle will show crease edges. Set the value to zero to disable crease edges. By default the crease angle is set to 70 degrees.
Use Shadows	Objects in the drawing cast shadows on other objects (but not on the active layer plane)
Quality	If Use Shadows is selected, select the level of quality for the shadow edges (a low setting uses less memory and renders faster)
On Ground Only	If Use Shadows is selected, select this option for drawing objects to cast shadows on a plane at the lowest point in the drawing — which is usually the active layer plane — but not on other objects

2. Select the OpenGL render options, and click OK to change the settings for the file.

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Rendering Modes

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