Wizt::BillboardBase Class Reference

Convenience class for drawing billboards using a Geometry Shader. More...

#include <Billboard.hpp>

Inheritance diagram for Wizt::BillboardBase:

Public Member Functions
void	initialize (Programmable &P) const
	BillboardBase (VObject *that)
bool	initializeAnemone (Anemone &RenderAnemone, VRenderContext &Context, AnemoneCreator<> &AC) const
RenderBasin::Program::Parameters	setProgramParameters (RenderBasin::Program::Parameters P, Anemone &RenderAnemone, const GridAnemone::AnemoneCreationContext &ARC, const RefPtr< GridAnemone::AnemoneExplorer > &AE) const
string	EmitBillboard_geom () const
	Define a function to transform world coordinates to screen coordinates.

Public Attributes
VObject::in< double >	inSizeScale

Detailed Description

Convenience class for drawing billboards using a Geometry Shader.

Member Function Documentation

EmitBillboard_geom()

string Wizt::BillboardBase::EmitBillboard_geom

(

)

const

Define a function to transform world coordinates to screen coordinates.

uniform vec3 TranslationVector;
vec4    WorldToScreen(vec4 theVertex);

       Routines to be used in a geometry shader to produce screen-oriented
       billboards.

       Functions are:

void    EmitScaledOrientedBillboard(vec4 theVertex, vec3 theCenterShift,
                                    vec3 ViewDir, float ScaleFactor);
 
void    EmitLocalOrientedBillboard(vec4 theVertex, vec3 ViewDir);
void    EmitLocalBillboardRelative(vec4 theVertex);
 
void    EmitOrientedBillboard(vec4 theVertex, vec3 ViewDir);
void    EmitBillboard(vec4 theVertex);
void    EmitScaledBillboard(vec4 theVertex, float ScaleFactor);

These routines will output a fragment shader variable WorldFragmentCoordinates containing the world coordinates of each pixel, relative to the uniform variable CenterShift (aka Origin) if the Local* functions are used.

References Wizt::embed_glsl().