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package com.jme3.scene.plugins.blender.textures;
import com.jme3.bounding.BoundingBox;
import com.jme3.bounding.BoundingSphere;
import com.jme3.math.FastMath;
import com.jme3.math.Triangle;
import com.jme3.math.Vector3f;
import com.jme3.scene.Mesh;
import com.jme3.scene.VertexBuffer;
import com.jme3.scene.plugins.blender.textures.UVCoordinatesGenerator.BoundingTube;
import java.nio.FloatBuffer;
/**
* This class helps with projection calculations.
*
* @author Marcin Roguski (Kaelthas)
*/
/* package */class UVProjectionGenerator {
/**
* Flat projection for 2D textures.
*
* @param mesh
* mesh that is to be projected
* @param bb
* the bounding box for projecting
* @return UV coordinates after the projection
*/
public static float[] flatProjection(Mesh mesh, BoundingBox bb) {
if (bb == null) {
bb = UVCoordinatesGenerator.getBoundingBox(mesh);
}
Vector3f min = bb.getMin(null);
float[] ext = new float[] { bb.getXExtent() * 2.0f, bb.getYExtent() * 2.0f };
FloatBuffer positions = mesh.getFloatBuffer(VertexBuffer.Type.Position);
float[] uvCoordinates = new float[positions.limit() / 3 * 2];
for (int i = 0, j = 0; i < positions.limit(); i += 3, j += 2) {
uvCoordinates[j] = (positions.get(i) - min.x) / ext[0];
uvCoordinates[j + 1] = (positions.get(i + 1) - min.y) / ext[1];
// skip the Z-coordinate
}
return uvCoordinates;
}
/**
* Cube projection for 2D textures.
*
* @param mesh
* mesh that is to be projected
* @param bb
* the bounding box for projecting
* @return UV coordinates after the projection
*/
public static float[] cubeProjection(Mesh mesh, BoundingBox bb) {
Triangle triangle = new Triangle();
Vector3f x = new Vector3f(1, 0, 0);
Vector3f y = new Vector3f(0, 1, 0);
Vector3f z = new Vector3f(0, 0, 1);
Vector3f min = bb.getMin(null);
float[] ext = new float[] { bb.getXExtent() * 2.0f, bb.getYExtent() * 2.0f, bb.getZExtent() * 2.0f };
float[] uvCoordinates = new float[mesh.getTriangleCount() * 6];// 6 == 3 * 2
float borderAngle = (float) Math.sqrt(2.0f) / 2.0f;
for (int i = 0, pointIndex = 0; i < mesh.getTriangleCount(); ++i) {
mesh.getTriangle(i, triangle);
Vector3f n = triangle.getNormal();
float dotNX = Math.abs(n.dot(x));
float dorNY = Math.abs(n.dot(y));
float dotNZ = Math.abs(n.dot(z));
if (dotNX > borderAngle) {
if (dotNZ < borderAngle) {// discard X-coordinate
uvCoordinates[pointIndex++] = (triangle.get1().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get1().z - min.z) / ext[2];
uvCoordinates[pointIndex++] = (triangle.get2().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get2().z - min.z) / ext[2];
uvCoordinates[pointIndex++] = (triangle.get3().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get3().z - min.z) / ext[2];
} else {// discard Z-coordinate
uvCoordinates[pointIndex++] = (triangle.get1().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get1().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get2().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get2().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get3().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get3().y - min.y) / ext[1];
}
} else {
if (dorNY > borderAngle) {// discard Y-coordinate
uvCoordinates[pointIndex++] = (triangle.get1().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get1().z - min.z) / ext[2];
uvCoordinates[pointIndex++] = (triangle.get2().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get2().z - min.z) / ext[2];
uvCoordinates[pointIndex++] = (triangle.get3().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get3().z - min.z) / ext[2];
} else {// discard Z-coordinate
uvCoordinates[pointIndex++] = (triangle.get1().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get1().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get2().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get2().y - min.y) / ext[1];
uvCoordinates[pointIndex++] = (triangle.get3().x - min.x) / ext[0];
uvCoordinates[pointIndex++] = (triangle.get3().y - min.y) / ext[1];
}
}
triangle.setNormal(null);// clear the previous normal vector
}
return uvCoordinates;
}
/**
* Tube projection for 2D textures.
*
* @param mesh
* mesh that is to be projected
* @param bt
* the bounding tube for projecting
* @return UV coordinates after the projection
*/
public static float[] tubeProjection(Mesh mesh, BoundingTube bt) {
FloatBuffer positions = mesh.getFloatBuffer(VertexBuffer.Type.Position);
float[] uvCoordinates = new float[positions.limit() / 3 * 2];
Vector3f v = new Vector3f();
float cx = bt.getCenter().x, cy = bt.getCenter().y;
Vector3f uBase = new Vector3f(0, -1, 0);
float vBase = bt.getCenter().z - bt.getHeight() * 0.5f;
for (int i = 0, j = 0; i < positions.limit(); i += 3, j += 2) {
// calculating U
v.set(positions.get(i)-cx, positions.get(i + 1)-cy, 0);
v.normalizeLocal();
float angle = v.angleBetween(uBase);// result between [0; PI]
if (v.x < 0) {// the angle should be greater than PI, we're on the other part of the image then
angle = FastMath.TWO_PI - angle;
}
uvCoordinates[j] = angle / FastMath.TWO_PI;
// calculating V
float z = positions.get(i + 2);
uvCoordinates[j + 1] = (z - vBase) / bt.getHeight();
}
//looking for splitted triangles
Triangle triangle = new Triangle();
for(int i=0;i<mesh.getTriangleCount();++i) {
mesh.getTriangle(i, triangle);
float sgn1 = Math.signum(triangle.get1().x-cx);
float sgn2 = Math.signum(triangle.get2().x-cx);
float sgn3 = Math.signum(triangle.get3().x-cx);
float xSideFactor = sgn1 + sgn2 + sgn3;
float ySideFactor = Math.signum(triangle.get1().y-cy)+
Math.signum(triangle.get2().y-cy)+
Math.signum(triangle.get3().y-cy);
if((xSideFactor>-3 || xSideFactor<3) && ySideFactor<0) {//the triangle is on the splitting plane
//indexOfUcoord = (indexOfTriangle*3 + indexOfTrianglesVertex)*2
if(sgn1==1.0f) {
uvCoordinates[i*3*2] += 1.0f;
}
if(sgn2==1.0f) {
uvCoordinates[(i*3+1)*2] += 1.0f;
}
if(sgn3==1.0f) {
uvCoordinates[(i*3+2)*2] += 1.0f;
}
}
}
return uvCoordinates;
}
/**
* Sphere projection for 2D textures.
*
* @param mesh
* mesh that is to be projected
* @param bb
* the bounding box for projecting
* @return UV coordinates after the projection
*/
public static float[] sphereProjection(Mesh mesh, BoundingSphere bs) {
FloatBuffer positions = mesh.getFloatBuffer(VertexBuffer.Type.Position);
float[] uvCoordinates = new float[positions.limit() / 3 * 2];
Vector3f v = new Vector3f();
float cx = bs.getCenter().x, cy = bs.getCenter().y, cz = bs.getCenter().z;
Vector3f uBase = new Vector3f(0, -1, 0);
Vector3f vBase = new Vector3f(0, 0, -1);
for (int i = 0, j = 0; i < positions.limit(); i += 3, j += 2) {
// calculating U
v.set(positions.get(i)-cx, positions.get(i + 1)-cy, 0);
v.normalizeLocal();
float angle = v.angleBetween(uBase);// result between [0; PI]
if (v.x < 0) {// the angle should be greater than PI, we're on the other part of the image then
angle = FastMath.TWO_PI - angle;
}
uvCoordinates[j] = angle / FastMath.TWO_PI;
// calculating V
v.set(positions.get(i)-cx, positions.get(i + 1)-cy, positions.get(i + 2)-cz);
v.normalizeLocal();
angle = v.angleBetween(vBase);// result between [0; PI]
uvCoordinates[j+1] = angle / FastMath.PI;
}
//looking for splitted triangles
Triangle triangle = new Triangle();
for(int i=0;i<mesh.getTriangleCount();++i) {
mesh.getTriangle(i, triangle);
float sgn1 = Math.signum(triangle.get1().x-cx);
float sgn2 = Math.signum(triangle.get2().x-cx);
float sgn3 = Math.signum(triangle.get3().x-cx);
float xSideFactor = sgn1 + sgn2 + sgn3;
float ySideFactor = Math.signum(triangle.get1().y-cy)+
Math.signum(triangle.get2().y-cy)+
Math.signum(triangle.get3().y-cy);
if((xSideFactor>-3 || xSideFactor<3) && ySideFactor<0) {//the triangle is on the splitting plane
//indexOfUcoord = (indexOfTriangle*3 + indexOfTrianglesVertex)*2
if(sgn1==1.0f) {
uvCoordinates[i*3*2] += 1.0f;
}
if(sgn2==1.0f) {
uvCoordinates[(i*3+1)*2] += 1.0f;
}
if(sgn3==1.0f) {
uvCoordinates[(i*3+2)*2] += 1.0f;
}
}
}
return uvCoordinates;
}
}
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