Types of blur
Here are the different types of shapes that are supported by legacy blur.
These shapes are configurable in the
Parameters
editor:
Gaussian
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Box
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Hexagonal
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Spin
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Radial
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Directional
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Circular
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Random
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Diffuse
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In addition to the choice of the shape, other parameters such as lightness and down-sampling can be configured. Here are three examples of legacy blur presets:
Here are more examples on the effect of the size and lightness parameters:
No Blur
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Size: 1 - Down Sampling 1/1 - Base size: 20px
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Size: 1 - Down Sampling 1/1 - Base size: 100px
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Size: 4 - Down Sampling 1/1 - Base size: 100px
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Size: 1 - Down Sampling 1/6 - Base size: 100px
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Size: 1 - Down Sampling 1/6 - Base size: 100px - Source Level: 100%
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Size: 1 - Down Sampling 1/6 - Base size: 100px - Source Level: 100% - Lightness: 50%
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You'll see also here a little trick to transform a 8bit picture into a 16bit one for smoother displacement when using the
Displace
Displace vertex along its normal
Read More
(check directly at 1min49). This method can be used in a general way to prevent banding in gradients :
Blur Parameters
Sample Numbers
: The size of the hight quality blur pass (number of samples used)
Samples down Sampling
: What level of precision these samples will be. For instance for an image of 64x64 pixels, with a down sampling of 1/32, the blur sample resolution will be of 2x2 pixels
Samples Distance
: Size of the low-quality blur pass (how far apart will the samples will be). The more higher the size is (more samples), the more the blur "radius" will seem high. Note that as base size is expressed in pixels, down sampling will also affect this parameter.