dtCore::TangentSpaceVisitor Class Reference

This visitor is used to generate tangents for your node. More...

#include <tangentspacevisitor.h>

List of all members.

Public Member Functions
	TangentSpaceVisitor (const std::string &vertexAttributeName, osg::Program *shaderProgram=NULL, int tangentVertexAttribNumber=6)
void	apply (osg::Geode &geode)

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Detailed Description

This visitor is used to generate tangents for your node.

It will stick the tangents on a Vertex Attribute Array. In Open GL Shader Language, each vertex can have a number of attributes (minimum supported is 16 = 0 to 15). You can use these attributes to put a single value for each vertex. This visitor generates tangents for each vertex and puts them in the specified array number (0 to 15). If you pass in the shader program, it will also bind the array number to a name, so you can use it in your Vertex Shader like this: attribute vec4 vTangent; Typically, tangents are put in index 6. An example usage looks like this: dtCore::RefPtr<TangentSpaceVisitor> visitor = new TangentSpaceVisitor (defaultShader, 6, "vTangent"); mMyCoolNode->accept(*visitor.get()); This visitor was based on osgFx::BumpMapping.cpp

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Constructor & Destructor Documentation

dtCore::TangentSpaceVisitor::TangentSpaceVisitor	(	const std::string &	vertexAttributeName,
		osg::Program *	shaderProgram = NULL,
		int	tangentVertexAttribNumber = 6
	)

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Member Function Documentation

void dtCore::TangentSpaceVisitor::apply

(

osg::Geode &

geode

)

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