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+/*
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+ * Copyright (c) 2009-2022 jMonkeyEngine
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ *
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+ * * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ *
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+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+package com.jme3.gde.core.scene.state;
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+
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+import com.jme3.app.Application;
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+import com.jme3.app.state.BaseAppState;
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+import com.jme3.gde.core.scene.SceneApplication;
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+import com.jme3.material.Material;
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+import com.jme3.scene.Geometry;
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+import com.jme3.scene.Node;
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+import com.jme3.scene.Spatial;
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+import com.jme3.util.TangentBinormalGenerator;
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+import java.util.ArrayList;
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+import java.util.List;
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+import jme3tools.optimize.GeometryBatchFactory;
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+
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+/**
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+ * Generates a set of geometries for debugging normals. Does not support moving
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+ * or animated meshes. Implementation ref:
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+ * https://hub.jmonkeyengine.org/t/debug-graphics-show-normals-as-lines/35058/3
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+ *
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+ * @author rickard
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+ */
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+public final class NormalViewState extends BaseAppState {
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+
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+ private final Node debugNode = new Node("Normals debug");
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+ private final float normalLength = 0.2f;
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+
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+ @Override
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+ protected void initialize(final Application app) {
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+ // not used
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+ }
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+
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+ @Override
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+ protected void cleanup(final Application app) {
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+ // not used
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+ }
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+
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+ @Override
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+ protected void onEnable() {
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+ final SceneApplication app = (SceneApplication) getApplication();
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+ final List<Geometry> geometries = new ArrayList<>();
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+ GeometryBatchFactory.gatherGeoms(app.getRootNode(), geometries);
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+ final Material debugMat = app.getAssetManager().loadMaterial(
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+ "Common/Materials/VertexColor.j3m");
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+
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+ for (final Geometry geometry : geometries) {
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+ final Geometry debug = new Geometry(geometry.getName(),
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+ TangentBinormalGenerator.genNormalLines(geometry.getMesh(),
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+ normalLength));
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+ debug.setMaterial(debugMat);
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+ debug.setCullHint(Spatial.CullHint.Never);
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+ debug.setLocalTransform(geometry.getWorldTransform());
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+ debugNode.attachChild(debug);
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+ }
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+ app.getRootNode().attachChild(debugNode);
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+ }
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+
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+ @Override
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+ public void update(float tpf) {
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+ super.update(tpf);
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+
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+ final Node rootNode = ((SceneApplication) getApplication()).getRootNode();
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+ for (final Spatial debug : debugNode.getChildren()) {
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+ final Spatial original = rootNode.getChild(debug.getName());
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+ if (original == null) {
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+ debug.removeFromParent();
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+ continue;
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+ }
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+ debug.setLocalTransform(original.getWorldTransform());
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+ }
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+ }
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+
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+ @Override
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+ protected void onDisable() {
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+ debugNode.removeFromParent();
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+ debugNode.detachAllChildren();
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+ }
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+
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+}
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Rickard Edén