Uh, I don't know if this is what you need, but this makes a sphere with the proper texcoords:
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| public static Geometry getSphere(int divisions, int radius) {
float sign = 1.0f;
float[] texCoords = new float[(divisions + 1) * (2 * divisions + 1) * 2];
float[] vertices = new float[(divisions + 1) * (2 * divisions + 1) * 3];
float[] normals = new float[(divisions + 1) * (2 * divisions + 1) * 3];
for (int i = 0;i <= divisions;i++) {
float rho = (float)((double)i * FastMath.PI / (double)divisions);
for (int j = 0;j <= 2 * divisions;j++) {
float theta = (float)((double)j * FastMath.PI / (double)divisions);
float vx = (float)(FastMath.cos(theta) * FastMath.sin(rho));
float vy = (float)(sign * FastMath.cos(rho));
float vz = (float)(FastMath.sin(theta) * FastMath.sin(rho));
texCoords[((i * (2 * divisions + 1)) + j) * 2 + 0] = 1f - (float)j / (2f * divisions);
texCoords[((i * (2 * divisions + 1)) + j) * 2 + 1] = (float)i / divisions;
vertices[((i * (2 * divisions + 1)) + j) * 3 + 0] = vx * radius;
vertices[((i * (2 * divisions + 1)) + j) * 3 + 1] = vy * radius;
vertices[((i * (2 * divisions + 1)) + j) * 3 + 2] = vz * radius;
normals[((i * (2 * divisions + 1)) + j) * 3 + 0] = vx * sign;
normals[((i * (2 * divisions + 1)) + j) * 3 + 1] = vy * sign;
normals[((i * (2 * divisions + 1)) + j) * 3 + 2] = vz * sign;
}
}
int[] vIdx = new int[divisions * 2 * divisions * 6];
int n = 0;
for (int i = 0;i < divisions;i++) {
for (int j = 0;j < 2 * divisions;j++) {
int v00 = i * (2 * divisions + 1) + j;
int v01 = i * (2 * divisions + 1) + j + 1;
int v10 = (i + 1) * (2 * divisions + 1) + j;
int v11 = (i + 1) * (2 * divisions + 1) + j + 1;
vIdx[n++] = v11;
vIdx[n++] = v10;
vIdx[n++] = v00;
vIdx[n++] = v11;
vIdx[n++] = v00;
vIdx[n++] = v01;
}
}
IndexedTriangleArray shapeGeom = new IndexedTriangleArray(vertices.length / 3,
GeometryArray.TEXTURE_COORDINATE_2 |
TriangleArray.COORDINATES |
TriangleArray.NORMALS, vIdx.length);
shapeGeom.setTextureCoordinates(0, 0, texCoords);
shapeGeom.setValidVertexCount(vertices.length / 3);
shapeGeom.setValidIndexCount(vIdx.length);
shapeGeom.setCoordinates(0, vertices);
shapeGeom.setNormals(0, normals);
shapeGeom.setIndex(vIdx);
return shapeGeom;
} |
