Tessellation shaders

VolumeViz GLSL tessellation shaders API. More...

Functions
vec3	VVizTessVertexShift (in vec3 position, in vec2 texCoord)
	SoVolumeShader::TESS_VERTEX_SHIFT function.

Detailed Description

VolumeViz GLSL tessellation shaders API.

Function Documentation

VVizTessVertexShift()

vec3 VVizTessVertexShift	(	in vec3	position,
		in vec2	texCoord
	)

SoVolumeShader::TESS_VERTEX_SHIFT function.

This function can be redefined by the application to modify each vertex position during HeightField rendering. It is associated with the SoVolumeShader::TESS_VERTEX_SHIFT shader stage. By default, the input position is returned.

The SoVolumeShader::TESS_VERTEX_SHIFT shader stage must be set with an SoTessellationEvaluationShader, but this function will also be called by the tessellation control stage and the fragment stage, so the shader code must only use the GLSL API that is common to those 3 stages.

Parameters

position	Vertex position on the HeightField surface in model space: XY in [-1, 1] and Z is the data set value, normalized for integer types (see SoHeightFieldRender).
texCoord	2D Texture coordinate assiciated with the 3D position.

Returns

The new vertex position in model space.