visualize
Class RayCasting

java.lang.Object
  visualize.RayCasting

public class RayCasting
extends java.lang.Object

The Class RayCasting is used for computing the 3-D view using RayCasting or Maximum-Intensity-Projection.

Version:

1.44

Author:

Fabian Hollaus, Markus Diem

Field Summary

static int	FBO_BACK
static int	FBO_FRONT
static int	FBO_TEXTURE_BACK
static int	FBO_TEXTURE_FRONT
static int	GRADIENT_TEX
static int	T_COLORS
static int	VOLUME_TEX
static int	X_DIR
static int	Y_DIR
static int	Z_DIR

Constructor Summary

RayCasting(javax.media.opengl.glu.GLU glu)
Creates a new RayCasting-object.

Method Summary

static void	checkLogInfo(javax.media.opengl.GL gl, int shader) Prints out the Info-Log of the shader passed in.
void	createFBO(javax.media.opengl.GL gl) For raycasting the coordinates of the rays are needed.
void	initShader(javax.media.opengl.GL gl) Loads the vertex-shader from raycasting.vsh and the fragment-shader from raycasting.fsh.
void	render(javax.media.opengl.GL gl) Is called continuously when the raycasting tab in the MainForm is activated and renders the 3-D Scene to the screen.
static void	setShader(boolean mip) Defines if raycasting or Maximum-Intensity-Projection is used in the fragment-shader.
static void	setStepSize(int stepS) Sets the step-size for computing the 3-D scene
void	setTexSize(float[] texSize) Sets the size of the volume-texture.
static void	setTransferFunctionChanged(boolean transColors) Called when the transfer-function is changed by the user.
void	setVolumeTex(int[] volumeTex) Sets the volume-texture

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

X_DIR

public static final int X_DIR

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Constant Field Values

Y_DIR

public static final int Y_DIR

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Constant Field Values

Z_DIR

public static final int Z_DIR

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Constant Field Values

FBO_TEXTURE_FRONT

public static final int FBO_TEXTURE_FRONT

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Constant Field Values

FBO_FRONT

public static final int FBO_FRONT

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Constant Field Values

FBO_TEXTURE_BACK

public static final int FBO_TEXTURE_BACK

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Constant Field Values

FBO_BACK

public static final int FBO_BACK

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Constant Field Values

T_COLORS

public static final int T_COLORS

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Constant Field Values

VOLUME_TEX

public static final int VOLUME_TEX

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Constant Field Values

GRADIENT_TEX

public static final int GRADIENT_TEX

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Constant Field Values

Constructor Detail

RayCasting

public RayCasting(javax.media.opengl.glu.GLU glu)

Creates a new RayCasting-object.

Parameters:

glu - provides access to the OpenGL Utility Library (GLU).

Method Detail

initShader

public void initShader(javax.media.opengl.GL gl)

Loads the vertex-shader from raycasting.vsh and the fragment-shader from raycasting.fsh. The two shaders are also compiled.

Parameters:

gl -

checkLogInfo

public static void checkLogInfo(javax.media.opengl.GL gl,
                                int shader)

Prints out the Info-Log of the shader passed in.

Parameters:

gl - basic interface to OpenGL

shader - shader which is going to be checked

createFBO

public void createFBO(javax.media.opengl.GL gl)

For raycasting the coordinates of the rays are needed. The coordinates are computed using a unitcube where the colors of the cube represent coordinates. The front- and back-face of the unitcube are stored in FrameBuffer-objects and those FrameBuffer-objects are created here.

Parameters:

gl - basic interface to OpenGL

render

public void render(javax.media.opengl.GL gl)

Is called continuously when the raycasting tab in the MainForm is activated and renders the 3-D Scene to the screen. To finish this task at first the front- and backface of the unitcube are computed, and are used later in computing the ray-vector in the fragment shader, where the volume-texture is rendered to screen.

Parameters:

gl - basic interface to OpenGL

setTexSize

public void setTexSize(float[] texSize)

Sets the size of the volume-texture.

Parameters:

texSize - texture-size in Float-array form.

setVolumeTex

public void setVolumeTex(int[] volumeTex)

Sets the volume-texture

Parameters:

volumeTex - volume-texture in integer-array form.

setShader

public static void setShader(boolean mip)

Defines if raycasting or Maximum-Intensity-Projection is used in the fragment-shader.

Parameters:

mip - Boolean describing if Maximum-Intensity-Projection is used or not.

setStepSize

public static void setStepSize(int stepS)

Sets the step-size for computing the 3-D scene

Parameters:

stepS - step-size in integer form.

setTransferFunctionChanged

public static void setTransferFunctionChanged(boolean transColors)

Called when the transfer-function is changed by the user.

Parameters:

transColors - If this boolean is true the content of the GradientColorPanel has changed. Otherwise the LineDrawPanel-content has changed.