public Tetrahedron() {
int i;
TriangleArray tetra =
new TriangleArray(
12,
TriangleArray.COORDINATES | TriangleArray.NORMALS | TriangleArray.TEXTURE_COORDINATE_2);
tetra.setCoordinates(0, verts);
for (i = 0; i < 12; i++) {
tetra.setTextureCoordinate(i, texCoord[i % 3]);
}
int face;
Vector3f normal = new Vector3f();
Vector3f v1 = new Vector3f();
Vector3f v2 = new Vector3f();
Point3f[] pts = new Point3f[3];
for (i = 0; i < 3; i++) pts[i] = new Point3f();
for (face = 0; face < 4; face++) {
tetra.getCoordinates(face * 3, pts);
v1.sub(pts[1], pts[0]);
v2.sub(pts[2], pts[0]);
normal.cross(v1, v2);
normal.normalize();
for (i = 0; i < 3; i++) {
tetra.setNormal((face * 3 + i), normal);
}
}
this.setGeometry(tetra);
this.setAppearance(new Appearance());
}
