Package com.j3d.engine.scene.draw.methods.utils

Class ZDepthIdBuffer

java.lang.Object

com.j3d.engine.scene.draw.methods.utils.ZDepthIdBuffer

public class ZDepthIdBuffer
extends Object

ZDepthIdBuffer is a high-performance software rasterizer used for object picking. It renders a scene into an off-screen buffer, storing the UUID of the topmost object at each pixel, along with its depth. This allows for fast determination of which objects are visible from the camera's perspective without drawing them to the screen. The primary optimisations include: - Integer-based triangle rasterisation using edge functions. - Incremental depth calculation. - Efficient collection of unique visible object IDs using a HashSet.

Author:

Gemini IntelliJ Plugin

See Also:

• VisibleSort

Field Summary

Fields

Modifier and Type	Field	Description
private final UUID[][]	buffer
private final float[][]	depthBuffer
private final int	height
private final int	width

Constructor Summary

Constructors

Constructor	Description
ZDepthIdBuffer()
ZDepthIdBuffer(int width, int height)
ZDepthIdBuffer(UUID[][] buffer, float[][] depthBuffer)

Method Summary

Modifier and Type	Method	Description
void	clear()
ArrayList<UUID>	draw(ArrayList<Layer> layers)	Processes all layers and returns a list of unique, visible object UUIDs.
UUID[][]	getBuffer()
float[][]	getDepthBuffer()
void	line(GLine line)
void	point(GPoint pt)
private void	rasterizeObject(GObject obj)
void	tri(GTri triangle)	Rasterizes a triangle using an efficient, integer-based edge-function algorithm.

Methods inherited from class java.lang.Object

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

Field Details

buffer

private final UUID[][] buffer

depthBuffer

private final float[][] depthBuffer

width

private final int width

height

private final int height

Constructor Details

ZDepthIdBuffer

public ZDepthIdBuffer()

ZDepthIdBuffer

public ZDepthIdBuffer(int width,
 int height)

ZDepthIdBuffer

public ZDepthIdBuffer(UUID[][] buffer,
 float[][] depthBuffer)

Method Details

clear

public void clear()

line

public void line(GLine line)

point

public void point(GPoint pt)

tri

public void tri(GTri triangle)

Rasterizes a triangle using an efficient, integer-based edge-function algorithm. This avoids costly floating-point operations per pixel.

draw

public ArrayList<UUID> draw(ArrayList<Layer> layers)

Processes all layers and returns a list of unique, visible object UUIDs. This uses a HashSet for efficient collection of unique IDs.

rasterizeObject

private void rasterizeObject(GObject obj)

getBuffer

public UUID[][] getBuffer()

getDepthBuffer

public float[][] getDepthBuffer()