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gamedev:textureproperties:texcoord_scale

Summary

Texture Property Nametexcoord.scale
DescriptionDefines the scaling for texture coordinates
Excepted Data Source3 component value
Data RangeGreater than 0 for all components
Default Value(1, 1, 1)
Affected ModulesGraphic
Linked Properties-

Description

The texcoord.scale texture property defines the scaling for texture coordinates. This texture property is useful to align individual materials of different detail scale.

To get an understanding of the problem imagine two textures. One contains a tiling rock image where the rocks all fit in your palm. The second texture has a tileable pebbles image where the pebbles are very small compared to the rocks of the first texture. Both textures are of the same size and contain a similar amount of rocks/pebbles to have a comparable detail resolution. If we map both textures to a 1×1 meter quadrilateral the pebbles texture suddely is way too large compared to the rocks texture. For both textures to have the same sense of scale compared to other textures the pebbles texture has to be scaled down a lot compared to the rocks texture. This could be done in the World Editor but this is cumbersome and requires adjusting texture transformations all the time textures are changed. To solve this problem texcoord.scale can be used to define a pre-scaling to be applied to a texture before any other texture transformations are done.

The scaling has to be chosen to get the correct size of the elements on the texture if mapped 1-to-1 on a 1×1 meter quadrilateral. If done correctly artists can only swap materials while creating maps without having to worry about texture scale differences. Furthermore their custom texture transformations still work correctly. If a texture artists wishes to scale a material up by the factor of two this works correctly with the texcoord.scale texture property producing in all cases a texture mapped at double the standard size no matter what the real size of the elements on the textures are.

The source is typically a 2 or 3 component value with all components greater than 0. The red component (component 1) defines the scaling in the U texture direction while the green component (component 2) defines the scaling in the V texture direction. If a 3D texture is used (image with depth larger than 1) the blue component (component 3) defines the scaling in the W texture direction.

The default value for this texture property is (1, 1, 1).

Examples

( TODO: example image )

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gamedev/textureproperties/texcoord_scale.txt · Last modified: 2012/12/02 16:55 by dragonlord