Class TessellatedTexturedTriangle

java.lang.Object

eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractShape

eu.svjatoslav.sixth.e3d.renderer.raster.shapes.AbstractCoordinateShape

eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon.TexturedTriangle

eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon.TessellatedTexturedTriangle

public class TessellatedTexturedTriangle
extends TexturedTriangle

A textured triangle with pre-computed screen-space coordinates.

This class is created by the ScreenSpaceTessellator during tessellation. Unlike regular TexturedTriangle, it skips the vertex transformation step during rendering because its screen coordinates and Z-depth are already computed.

This optimization avoids redundant coordinate transformation for tessellated sub-triangles, improving performance when large polygons are split into many smaller pieces.

See Also:

• ScreenSpaceTessellator
• TexturedTriangle

Field Summary

Fields inherited from class TexturedTriangle

texture

Fields inherited from class AbstractCoordinateShape

onScreenZ, shapeId, vertices

Fields inherited from class AbstractShape

cachedBoundingBox, mouseInteractionController

Constructor Summary

Constructors

Constructor	Description
TessellatedTexturedTriangle(Vertex v1, Vertex v2, Vertex v3, Texture texture)	Creates a tessellated textured triangle with pre-computed screen coordinates.

Method Summary

Modifier and Type	Method	Description
static Vertex	interpolateMidpoint(Vertex v1, Vertex v2, Point2D screen1, Point2D screen2)	Creates a tessellated triangle by interpolating between two vertices.
void	transform(TransformStack transforms, RenderAggregator aggregator, RenderingContext renderingContext)	Transforms this triangle for rendering by transforming vertices normally.

Methods inherited from class TexturedTriangle

computeMaxScreenEdgeLength, getLastScreenSpaceSize, hasPreviousScreenCoordinates, isBackfaceCullingEnabled, needsRetessellation, paint, setBackfaceCulling, setLastScreenSpaceSize

Methods inherited from class AbstractCoordinateShape

getBoundingBox, getZ, translate

Methods inherited from class AbstractShape

invalidateBounds, setMouseInteractionController

Methods inherited from class Object

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

Constructor Details

TessellatedTexturedTriangle

public TessellatedTexturedTriangle(Vertex v1,
 Vertex v2,
 Vertex v3,
 Texture texture)

Creates a tessellated textured triangle with pre-computed screen coordinates.

The vertices' Vertex.onScreenCoordinate and Vertex.transformedCoordinate are already populated, so the transform(TransformStack, RenderAggregator, RenderingContext) method will skip coordinate calculation.

Parameters:

v1 - the first vertex (world coords, texture coords, screen coords pre-computed)

v2 - the second vertex (world coords, texture coords, screen coords pre-computed)

v3 - the third vertex (world coords, texture coords, screen coords pre-computed)

texture - the texture to apply

Method Details

transform

public void transform(TransformStack transforms,
 RenderAggregator aggregator,
 RenderingContext renderingContext)

Transforms this triangle for rendering by transforming vertices normally.

Unlike the original design that skipped transformation, this method now transforms vertices normally using their world coordinates. The world coordinates were correctly interpolated during tessellation, so the resulting screen coordinates will be fresh for each frame.

Overrides:

transform in class AbstractCoordinateShape

Parameters:

transforms - the transform stack to apply

aggregator - the aggregator to queue this shape for rendering

renderingContext - the rendering context

interpolateMidpoint

public static Vertex interpolateMidpoint(Vertex v1,
 Vertex v2,
 Point2D screen1,
 Point2D screen2)

Creates a tessellated triangle by interpolating between two vertices.

This factory method creates a new vertex at the midpoint of two vertices, interpolating world coordinates, texture coordinates, screen coordinates, and Z-depth. Used during tessellation to split edges.

Parameters:

v1 - the first vertex endpoint

v2 - the second vertex endpoint

screen1 - the screen coordinate of the first vertex

screen2 - the screen coordinate of the second vertex

Returns:

a new vertex at the midpoint with interpolated properties