shaders/DividingCubes.gs File Reference

A dividing cubes geometry shader. More...

Functions
vec3	getCubeCorner (int _index)
	Returns a cube's corner.
float	sampleVert (int _i)
	Samples the scalar field on a grid vertex.
int	fetchEdgeTableVal (int _i)
	Fetches a texel of the edge table texture.
void	main (void)
	Geometry shader entry point.
Variables
uniform isampler1D	edgeTableTex
	The edge table texture.
uniform vec3	marchingStep
	The marching step.
uniform float	isoLevel
	The iso level threshold.
uniform sampler3D	densityTex
	the scalar field's 3D texture.
uniform int	samplingChannel
	The texture channel to sample from.
uniform mat4	projectionMatrix
	The Projection Matrix generated from the Camera.
uniform mat4	ViewMatrix
	The View Matrix generated from the Camera.
uniform mat4	ModelMatrix
	The Model Matrix generated from the scene transforms.
varying out vec4	position
	The calculated vertex positions (output to fragment shader).

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Detailed Description

A dividing cubes geometry shader.

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Function Documentation

int fetchEdgeTableVal

(

int

_i

)

Fetches a texel of the edge table texture.

Parameters:

[in]

_i

table index

vec3 getCubeCorner

(

int

_index

)

Returns a cube's corner.

Parameters:

[in]

_index

The corner index.

The following section is modified from :- Cyril Crassin (2007). Tutorial on implementing Marching Cubes algorithm using OpenGL API Geometry Shaders extension available at: http://www.icare3d.org/content/view/50/9/ accessed at 02/04/11

end of citation

void main

(

void

)

Geometry shader entry point.

The following section is modified from :- Cyril Crassin (2007). Tutorial on implementing Marching Cubes algorithm using OpenGL API Geometry Shaders extension available at: http://www.icare3d.org/content/view/50/9/ accessed at 02/04/11

end of citation

float sampleVert

(

int

_i

)

Samples the scalar field on a grid vertex.

Parameters:

[in]

_the

vertex index.