CodeChickenCore/codechicken/lib/render/CCModelLibrary.java

package codechicken.lib.render;

import codechicken.lib.vec.Matrix4;
import codechicken.lib.vec.Quat;
import codechicken.lib.vec.Rotation;
import codechicken.lib.vec.Scale;
import codechicken.lib.vec.Vector3;

import static codechicken.lib.math.MathHelper.phi;

public class CCModelLibrary
{
    public static CCModel icosahedron4;
    public static CCModel icosahedron7;
    
    private static int i;
    
    static
    {
        generateIcosahedron();
    }

    private static void generateIcosahedron()
    {
        Vector3[] verts = new Vector3[12];

        verts[0] = new Vector3(-1, phi, 0);
        verts[1] = new Vector3( 1, phi, 0);
        verts[2] = new Vector3( 1,-phi, 0);
        verts[3] = new Vector3(-1,-phi, 0);

        verts[4] = new Vector3(0,-1, phi);
        verts[5] = new Vector3(0, 1, phi);
        verts[6] = new Vector3(0, 1,-phi);
        verts[7] = new Vector3(0,-1,-phi);

        verts[8] =  new Vector3( phi, 0,-1);
        verts[9] =  new Vector3( phi, 0, 1);
        verts[10] = new Vector3(-phi, 0, 1);
        verts[11] = new Vector3(-phi, 0,-1);

        Quat quat = Quat.aroundAxis(0, 0, 1, Math.atan(1/phi));
        for(Vector3 vec : verts)
            quat.rotate(vec);
        
        icosahedron4 = CCModel.newModel(4, 60);
        icosahedron7 = CCModel.newModel(7, 80);

        i = 0;
        //top
        addIcosahedronTriangle(verts[1], 0.5, 0, verts[0], 0, 0.25, verts[5], 1, 0.25);
        addIcosahedronTriangle(verts[1], 0.5, 0, verts[5], 0, 0.25, verts[9], 1, 0.25);
        addIcosahedronTriangle(verts[1], 0.5, 0, verts[9], 0, 0.25, verts[8], 1, 0.25);
        addIcosahedronTriangle(verts[1], 0.5, 0, verts[8], 0, 0.25, verts[6], 1, 0.25);
        addIcosahedronTriangle(verts[1], 0.5, 0, verts[6], 0, 0.25, verts[0], 1, 0.25);
        //centre 1vert top
        addIcosahedronTriangle(verts[0], 0.5, 0.25, verts[11],0, 0.75, verts[10],1, 0.75);
        addIcosahedronTriangle(verts[5], 0.5, 0.25, verts[10],0, 0.75, verts[4], 1, 0.75);
        addIcosahedronTriangle(verts[9], 0.5, 0.25, verts[4], 0, 0.75, verts[2], 1, 0.75);
        addIcosahedronTriangle(verts[8], 0.5, 0.25, verts[2], 0, 0.75, verts[7], 1, 0.75);
        addIcosahedronTriangle(verts[6], 0.5, 0.25, verts[7], 0, 0.75, verts[11],1, 0.75);
        //centre 1vert bottom
        addIcosahedronTriangle(verts[2], 0.5, 0.75, verts[8], 0, 0.25, verts[9], 1, 0.25);
        addIcosahedronTriangle(verts[7], 0.5, 0.75, verts[6], 0, 0.25, verts[8], 1, 0.25);
        addIcosahedronTriangle(verts[11],0.5, 0.75, verts[0], 0, 0.25, verts[6], 1, 0.25);
        addIcosahedronTriangle(verts[10],0.5, 0.75, verts[5], 0, 0.25, verts[0], 1, 0.25);
        addIcosahedronTriangle(verts[4], 0.5, 0.75, verts[9], 0, 0.25, verts[5], 1, 0.25);
        //bottom
        addIcosahedronTriangle(verts[3], 0.5, 1, verts[2], 0, 0.75, verts[4], 1, 0.75);
        addIcosahedronTriangle(verts[3], 0.5, 1, verts[7], 0, 0.75, verts[2], 1, 0.75);
        addIcosahedronTriangle(verts[3], 0.5, 1, verts[11],0, 0.75, verts[7], 1, 0.75);
        addIcosahedronTriangle(verts[3], 0.5, 1, verts[10],0, 0.75, verts[11],1, 0.75);
        addIcosahedronTriangle(verts[3], 0.5, 1, verts[4], 0, 0.75, verts[10],1, 0.75);
        
        icosahedron4.computeNormals().smoothNormals();
        icosahedron7.computeNormals().smoothNormals();
    }

    private static void addIcosahedronTriangle(Vector3 vec1, double u1, double v1, 
            Vector3 vec2, double u2, double v2, 
            Vector3 vec3, double u3, double v3)
    {
        icosahedron4.verts[i*3] = icosahedron7.verts[i*4] = new Vertex5(vec1, u1, v1);
        icosahedron4.verts[i*3+1] = icosahedron7.verts[i*4+1] = new Vertex5(vec2, u2, v2);
        icosahedron4.verts[i*3+2] = icosahedron7.verts[i*4+2] = icosahedron7.verts[i*4+3] = new Vertex5(vec3, u3, v3);
        i++;
    }
    
    public static Matrix4 getRenderMatrix(Vector3 position, Rotation rotation, double scale)
    {
        return new Matrix4().translate(position).apply(new Scale(scale)).apply(rotation);
    }
}