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diff --git a/src/gleem/NormalCalc.java b/src/gleem/NormalCalc.java
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-/*
- * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
- * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
- *
- * Copying, distribution and use of this software in source and binary
- * forms, with or without modification, is permitted provided that the
- * following conditions are met:
- *
- * Distributions of source code must reproduce the copyright notice,
- * this list of conditions and the following disclaimer in the source
- * code header files; and Distributions of binary code must reproduce
- * the copyright notice, this list of conditions and the following
- * disclaimer in the documentation, Read me file, license file and/or
- * other materials provided with the software distribution.
- *
- * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
- * holder may not be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
- * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
- * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
- * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
- * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
- * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
- * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
- * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
- * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
- * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
- * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
- * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
- * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
- * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
- * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
- * WARRANTY OF FITNESS FOR SUCH USES.
- */
-
-package gleem;
-
-import java.util.*;
-
-import gleem.linalg.*;
-
-/** Calculates normals for a set of polygons. */
-
-public class NormalCalc {
-
- /** Set of normals computed using {@link gleem.NormalCalc}. */
- public static class NormalInfo {
- public Vec3f[] normals;
- public int[] normalIndices;
-
- NormalInfo(Vec3f[] normals, int[] normalIndices) {
- this.normals = normals;
- this.normalIndices = normalIndices;
- }
- }
-
- /** Returns null upon failure, or a set of Vec3fs and integers
- which represent faceted (non-averaged) normals, but per-vertex.
- Performs bounds checking on indices with respect to vertex list.
- Index list must represent independent triangles; indices are
- taken in groups of three. If index list doesn't represent
- triangles or other error occurred then returns null. ccw flag
- indicates whether triangles are specified counterclockwise when
- viewed from top or not. */
-
- public static NormalInfo computeFacetedNormals(Vec3f[] vertices,
- int[] indices,
- boolean ccw) {
- if ((indices.length % 3) != 0) {
- System.err.println("NormalCalc.computeFacetedNormals: numIndices wasn't " +
- "divisible by 3, so it can't possibly " +
- "represent a set of triangles");
- return null;
- }
-
- Vec3f[] outputNormals = new Vec3f[indices.length / 3];
- int[] outputNormalIndices = new int[indices.length];
-
- Vec3f d1 = new Vec3f();
- Vec3f d2 = new Vec3f();
- int curNormalIndex = 0;
- for (int i = 0; i < indices.length; i += 3) {
- int i0 = indices[i];
- int i1 = indices[i+1];
- int i2 = indices[i+2];
- if ((i0 < 0) || (i0 >= indices.length) ||
- (i1 < 0) || (i1 >= indices.length) ||
- (i2 < 0) || (i2 >= indices.length)) {
- System.err.println("NormalCalc.computeFacetedNormals: ERROR: " +
- "vertex index out of bounds or no end of triangle " +
- "index found");
- return null;
- }
- Vec3f v0 = vertices[i0];
- Vec3f v1 = vertices[i1];
- Vec3f v2 = vertices[i2];
- d1.sub(v1, v0);
- d2.sub(v2, v0);
- Vec3f n = new Vec3f();
- if (ccw) {
- n.cross(d1, d2);
- } else {
- n.cross(d2, d1);
- }
- n.normalize();
- outputNormals[curNormalIndex] = n;
- outputNormalIndices[i] = curNormalIndex;
- outputNormalIndices[i+1] = curNormalIndex;
- outputNormalIndices[i+2] = curNormalIndex;
- curNormalIndex++;
- }
- return new NormalInfo(outputNormals, outputNormalIndices);
- }
-}