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Refactor: PointLightShadowRenderer reduce object allocations #2514

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Refactor: PointLightShadowRenderer reduce object allocations #2514

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5f24d20
Update PointLightShadowRenderer.java
capdevon Jun 23, 2025
af44800
PointLightShadowRenderer: fix javadoc
capdevon Jun 24, 2025
85722e8
PointLightShadowRenderer: restored original author name
capdevon Jul 10, 2025
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87 changes: 42 additions & 45 deletions jme3-core/src/main/java/com/jme3/shadow/PointLightShadowRenderer.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2009-2021 jMonkeyEngine
* Copyright (c) 2009-2025 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
Expand Down Expand Up @@ -51,33 +51,39 @@
import java.io.IOException;

/**
* PointLightShadowRenderer renders shadows for a point light
* Renders shadows for a {@link PointLight}. This renderer uses six cameras,
* one for each face of a cube map, to capture shadows from the point light's
* perspective.
*
* @author Rémy Bouquet aka Nehon
* @author Nehon
*/
public class PointLightShadowRenderer extends AbstractShadowRenderer {

/**
* The fixed number of cameras used for rendering point light shadows (6 for a cube map).
*/
public static final int CAM_NUMBER = 6;

protected PointLight light;
protected Camera[] shadowCams;
private Geometry[] frustums = null;
protected Geometry[] frustums = null;
protected final Vector3f X_NEG = Vector3f.UNIT_X.mult(-1f);
protected final Vector3f Y_NEG = Vector3f.UNIT_Y.mult(-1f);
protected final Vector3f Z_NEG = Vector3f.UNIT_Z.mult(-1f);

/**
* Used for serialization.
* Use PointLightShadowRenderer#PointLightShadowRenderer(AssetManager
* assetManager, int shadowMapSize)
* instead.
* For serialization only. Do not use.
*/
protected PointLightShadowRenderer() {
super();
}

/**
* Creates a PointLightShadowRenderer
* Creates a new {@code PointLightShadowRenderer} instance.
*
* @param assetManager the application asset manager
* @param shadowMapSize the size of the rendered shadowmaps (512,1024,2048,
* etc...)
* @param assetManager The application's asset manager.
* @param shadowMapSize The size of the rendered shadow maps (e.g., 512, 1024, 2048).
* Higher values produce better quality shadows but may impact performance.
*/
public PointLightShadowRenderer(AssetManager assetManager, int shadowMapSize) {
super(assetManager, shadowMapSize, CAM_NUMBER);
Expand All @@ -86,7 +92,7 @@ public PointLightShadowRenderer(AssetManager assetManager, int shadowMapSize) {

private void init(int shadowMapSize) {
shadowCams = new Camera[CAM_NUMBER];
for (int i = 0; i < CAM_NUMBER; i++) {
for (int i = 0; i < shadowCams.length; i++) {
shadowCams[i] = new Camera(shadowMapSize, shadowMapSize);
}
}
Expand All @@ -95,9 +101,9 @@ private void init(int shadowMapSize) {
protected void initFrustumCam() {
Camera viewCam = viewPort.getCamera();
frustumCam = viewCam.clone();
frustumCam.setFrustum(viewCam.getFrustumNear(), zFarOverride, viewCam.getFrustumLeft(), viewCam.getFrustumRight(), viewCam.getFrustumTop(), viewCam.getFrustumBottom());
frustumCam.setFrustum(viewCam.getFrustumNear(), zFarOverride,
viewCam.getFrustumLeft(), viewCam.getFrustumRight(), viewCam.getFrustumTop(), viewCam.getFrustumBottom());
}


@Override
protected void updateShadowCams(Camera viewCam) {
Expand All @@ -107,31 +113,21 @@ protected void updateShadowCams(Camera viewCam) {
return;
}

//bottom
shadowCams[0].setAxes(Vector3f.UNIT_X.mult(-1f), Vector3f.UNIT_Z.mult(-1f), Vector3f.UNIT_Y.mult(-1f));

//top
shadowCams[1].setAxes(Vector3f.UNIT_X.mult(-1f), Vector3f.UNIT_Z, Vector3f.UNIT_Y);

//forward
shadowCams[2].setAxes(Vector3f.UNIT_X.mult(-1f), Vector3f.UNIT_Y, Vector3f.UNIT_Z.mult(-1f));

//backward
shadowCams[3].setAxes(Vector3f.UNIT_X, Vector3f.UNIT_Y, Vector3f.UNIT_Z);

//left
shadowCams[4].setAxes(Vector3f.UNIT_Z, Vector3f.UNIT_Y, Vector3f.UNIT_X.mult(-1f));

//right
shadowCams[5].setAxes(Vector3f.UNIT_Z.mult(-1f), Vector3f.UNIT_Y, Vector3f.UNIT_X);

for (int i = 0; i < CAM_NUMBER; i++) {
shadowCams[i].setFrustumPerspective(90f, 1f, 0.1f, light.getRadius());
shadowCams[i].setLocation(light.getPosition());
shadowCams[i].update();
shadowCams[i].updateViewProjection();
// Configure axes for each of the six cube map cameras (positive/negative X, Y, Z)
shadowCams[0].setAxes(X_NEG, Z_NEG, Y_NEG); // -Y (bottom)
shadowCams[1].setAxes(X_NEG, Vector3f.UNIT_Z, Vector3f.UNIT_Y); // +Y (top)
shadowCams[2].setAxes(X_NEG, Vector3f.UNIT_Y, Z_NEG); // +Z (forward)
shadowCams[3].setAxes(Vector3f.UNIT_X, Vector3f.UNIT_Y, Vector3f.UNIT_Z); // -Z (backward)
shadowCams[4].setAxes(Vector3f.UNIT_Z, Vector3f.UNIT_Y, X_NEG); // -X (left)
shadowCams[5].setAxes(Z_NEG, Vector3f.UNIT_Y, Vector3f.UNIT_X); // +X (right)

// Set perspective and location for all shadow cameras
for (Camera shadowCam : shadowCams) {
shadowCam.setFrustumPerspective(90f, 1f, 0.1f, light.getRadius());
shadowCam.setLocation(light.getPosition());
shadowCam.update();
shadowCam.updateViewProjection();
}

}

@Override
Expand Down Expand Up @@ -160,16 +156,17 @@ protected void doDisplayFrustumDebug(int shadowMapIndex) {
if (frustums == null) {
frustums = new Geometry[CAM_NUMBER];
Vector3f[] points = new Vector3f[8];
for (int i = 0; i < 8; i++) {
for (int i = 0; i < points.length; i++) {
points[i] = new Vector3f();
}
for (int i = 0; i < CAM_NUMBER; i++) {
ShadowUtil.updateFrustumPoints2(shadowCams[i], points);
frustums[i] = createFrustum(points, i);
}
}
if (frustums[shadowMapIndex].getParent() == null) {
((Node) viewPort.getScenes().get(0)).attachChild(frustums[shadowMapIndex]);
Geometry geo = frustums[shadowMapIndex];
if (geo.getParent() == null) {
((Node) viewPort.getScenes().get(0)).attachChild(geo);
}
}

Expand Down Expand Up @@ -237,13 +234,13 @@ protected boolean checkCulling(Camera viewCam) {
}

Camera cam = viewCam;
if(frustumCam != null){
cam = frustumCam;
if (frustumCam != null) {
cam = frustumCam;
cam.setLocation(viewCam.getLocation());
cam.setRotation(viewCam.getRotation());
}
TempVars vars = TempVars.get();
boolean intersects = light.intersectsFrustum(cam,vars);
boolean intersects = light.intersectsFrustum(cam, vars);
vars.release();
return intersects;
}
Expand Down