The kernelUnitLength attribute has two meanings based on the context it's used in. For lighting filter primitives, it indicates the intended distance for the x and y coordinates, for <feConvolveMatrix>, it indicates the intended distance between successive columns and rows in the kernel matrix.
You can use this attribute with the following SVG elements:
feConvolveMatrixFor the <feConvolveMatrix>, kernelUnitLength indicates the intended distance in current filter units (i.e., units as determined by the value of primitiveUnits attribute) between successive columns and rows, respectively, in the kernelMatrix. By specifying value(s) for kernelUnitLength, the kernel becomes defined in a scalable, abstract coordinate system. If the attribute is not specified, the default value is one pixel in the offscreen bitmap, which is a pixel-based coordinate system, and thus potentially not scalable.
If a negative or zero value is specified the default value will be used instead.
<number-optional-number>
The first number is the x value. The second number is the y value. If the x value is not specified, it defaults to the same value as x.
For the <feDiffuseLighting>, kernelUnitLength indicates the intended distance in current filter units (i.e., units as determined by the value of attribute primitiveUnits) for the x and y coordinate, respectively, in the surface normal calculation formulas.
The first number is the x value. The second number is the y value. If the y value is not specified, it defaults to the same value as x. By specifying value(s) for kernelUnitLength, the kernel becomes defined in a scalable, abstract coordinate system. If the attribute is not specified, the x and y values represent very small deltas relative to a given position, which might be implemented in some cases as one pixel in the intermediate image offscreen bitmap, which is a pixel-based coordinate system, and thus potentially not scalable.
If a negative or zero value is specified the default value will be used instead.
feSpecularLightingFor the <feSpecularLighting>, kernelUnitLength indicates the intended distance in current filter units (i.e., units as determined by the value of attribute primitiveUnits) for the x and y coordinate, respectively, in the surface normal calculation formulas.
The first number is the x value. The second number is the y value. If the y value is not specified, it defaults to the same value as x. By specifying value(s) for kernelUnitLength, the kernel becomes defined in a scalable, abstract coordinate system. If the attribute is not specified, the x and y values represent very small deltas relative to a given position, which might be implemented in some cases as one pixel in the intermediate image offscreen bitmap, which is a pixel-based coordinate system, and thus potentially not scalable.
If a negative or zero value is specified the default value will be used instead.
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