HeightMap Class Reference

This class can be used to create models from height maps. More...

#include <myDrawable.h>

Inherits myDrawable.

Inherited by Water.

List of all members.

Public Member Functions
	HeightMap (GLuint drawProgram, GLuint *sizes, GLfloat maxHeight, GLuint inputHeightBuffer)
	Simple contructor.
virtual void	draw ()
	Draws the height field using the set draw program and texture.
void	generateHeightTexture ()
	Generates the height data texture.
virtual void	update ()
	Calculates the new vertex data from the height map buffer.
Static Public Member Functions
static void TW_CALL	GetTextureCB (void *value, void *clientData)
	Used by AntTweakBar to get which texture is in use.
static void TW_CALL	SetTextureCB (const void *value, void *clientData)
	Used by AntTweakBar to set which texture to use.
Protected Member Functions
void	initDraw ()
	Sets the VAO pointers for drawing the model.
void	initUpdate ()
	Creates the buffers and shader programs.
Protected Attributes
GLuint	dataHeight
	Height of the data in the height map.
GLfloat	dataTerrainHeight
	Diff between lowest and highest point in the height map.
GLuint	dataWidth
	Width of the data in the height map.
GLuint	drawBuffers [4]
	The vertice data buffers in order: Vertex coordinate, Texture Coordinate, Normals, Incides.
GLuint	drawVAO
	Vertex Array for the drawable information.
GLuint	heightBuffer
	Buffer with the height data information.
GLuint	heightMapProgram
	Compute shader that generates the rest of the vertex data.
GLuint	normalsProgram
	Compute shader for calculating the normals from a height map.
GLuint	numData
	Total number of vertices needed.
GLuint	numIndices
	Total number of indices needed.
GLuint	texnum
	Currently used texture.
GLuint	textureProgram
	Creates a texture with normal and height data, for use in other shaders where interpolation is important.

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Detailed Description

This class can be used to create models from height maps.

Creates vertex data from a heightmap, generates vertices, normals, texture coordinates and indices for drawing.

Definition at line 104 of file myDrawable.h.

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Constructor & Destructor Documentation

HeightMap::HeightMap	(	GLuint	drawProgram,
		GLuint *	sizes,
		GLfloat	maxHeight,
		GLuint	inputHeightBuffer
	)

Simple contructor.

Takes a few parameters for initial setup of the size of the height map data.

Parameters:

drawProgram	The initial program to use for drawing the model
sizes	Width and Height of the data
maxHeight	The height map maximum height (low assumed to be 0)
inputHeightBuffer	Buffer ID of the height map data

Definition at line 179 of file myDrawable.cpp.

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Member Function Documentation

void HeightMap::initDraw

(

)

[protected]

Sets the VAO pointers for drawing the model.

Also uploads some of the static uniforms that are used for drawing.

Definition at line 230 of file myDrawable.cpp.

void HeightMap::initUpdate

(

)

[protected]

Creates the buffers and shader programs.

Init for creating buffers and shaders used for creating and/or updating the model vertice data.

Definition at line 197 of file myDrawable.cpp.

void HeightMap::update

(

)

[virtual]

Calculates the new vertex data from the height map buffer.

Calculates the normals first using sobel filters in x and z direction and then sets a height for y that makes the result look good (might need tuning). After that the rest of the data is pretty straight forward to generate.

Implements myDrawable.

Definition at line 298 of file myDrawable.cpp.

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The documentation for this class was generated from the following files:

• src/myDrawable.h
• src/myDrawable.cpp