WorldVertexTransition

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Application without and with $blendmodulatetexture.

WorldVertexTransition is a s0 available in all Source games. It is a shader functionally similar to LightmappedGeneric primarily used to perform a per-vertex linear blend between two textures on a displacement surface. Many of the parameter definitions for the secondary material are the same as the first material except with a "2" at the end. ex: $basetexture2

You can choose which texture you would like to appear on a vertex using Hammer's alpha painting tool. The blend is normally a linear gradient, but you can control the blend on a per-pixel basis by specifying $blendmodulatetexture in the material.

Important:In Black Mesa this shader was missed in the deferred renderer update. Instead, use LightmappedGeneric, which, in Black Mesa, has all the features of WorldVertexTransition.

Caveats

Note:You can also use $vertexalpha to create a material that fades out. This uses the first $basetexture then fades out with the blend. Unfortunately, it is treated the same as a material with $translucent and can have sorting issues with other transparency objects.

Note:This shader now only works on displacements. If used on a regular brush, VBSP will generate and pack a LightmappedGeneric version of the material automatically, discarding the secondary texture.

Note:The shader LightmappedGeneric does texture blending as well and supports many of the same features as this shader.

Confirm:Does WorldVertexTransition support any features that LightmappedGeneric does not?

Bug:$blendmodulatetexture does not display in hammer despite the shader LightmappedGeneric displaying it correctly. Instead it displays a linear blend. This has been fixed in   [todo tested in ?]

Todo: This shader was significantly upgraded in with new parameters, a new layer blending mode, drop shadows, and support for layer-specific detail textures and specular masks. Document these.

Example

WorldVertexTransition
{
	$basetexture nature/dirtfloor006a
	$surfaceprop dirt

	$basetexture2 nature/rockfloor005a
	$surfaceprop2 rock

	%tooltexture nature/blendrockgrass004a_tooltexture
}

• Some visual effects can be selectively applied to one sub-material or the other. See the relevant articles for more details.
• The Hammer material browser won't be able to display a preview of the material unless it's given a %tooltexture.

Supported Parameters

$basetexture $basetexture2 $bumpmap $bumpmap2 $blendmodulatetexture $detail $envmap $lightwarptexture $seamless_scale $selfillum $ssbump $translucent $alpha $vertexalpha $additive $phong $phong_exp $phong_exp2 $layertint1 $layertint2 [[%detailtype|%detailtype]]

See also

• LightmappedGeneric, the standard shader for lightmapped surfaces.
• Lightmapped_4WayBlend, an upgraded displacement blend shader for .
• LightmappedTwoTexture, a brush shader that multiplies a texture on top of another one.
• WorldTwoTextureBlend, a brush shader that applies a texture on top of another one using $detail.
• Displacement, the surface type this shader is used on.