Fast Render Strategies

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There are several techniques you can use to speed up the rendering process. These techniques are most useful when rendering animations, where you may have a large number of images to render.

You can greatly increase the speed of a render just by using the Preview Render modes. Below is a table showing the percentage of time it takes to a render a scene, containing complex materials and lights, using normal and preview modes.

Render Option	% of standard time
Normal Render	100%
Fast Render	41.7%
Textures Off	35.4%
Fast Render w/Textures Off	8.3%
Fast, Textures Off, anti-aliasing Off	2.1%

Patch Rendering

Using the Plop-Render mode, you can do a patch render of image. Patch rendering involves the rendering of background and flat elements using normal rendering and then using the Plop-Render controls to render areas that contain more complex elements.

There are two things you should remember when using patch rendering:

• Make sure you use the Clear and Render button when you make changes to a partially rendered image. If you stop a rendering, make changes and then click Resume Render, you'll end up with noise instead of an image.
• If you change elements that don't affect a large area of your scene, you don't have to render the entire scene again. For example, if you render a scene with a floating sphere and then delete the sphere, you don't need to re-render the scene, only the area where the sphere was.

To patch render your image:

1 Start a render as normal.

2 Let the rendering proceed for two or three passes and then click the mouse.

3 Switch to Bitmap display mode.

4 Drag a marquee around key portions of your scene and then render those areas using the Plop-Render controls.

You can also speed up rendering using these techniques:

• Limit the number of lights.
• Keep background objects simple.
• Limit the number of volume materials you apply.
• Limit the number of transparent and reflective objects.
• Limit the number of frames per second to 15 for QuickTime movies.
• Divide animations into smaller files and eliminate objects that won't be seen in the rendered frames.
• Turn off anti-aliasing when previewing animations.

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