A mesh can be created programmatically in jMonkeyEngine.
The cube has 24 vertex points with 8 physical vertex points, each with 3 normals.
// *** 1. Start (24 pts in cube with normal)
Vector3f [] vert = new Vector3f[24];
vert[0] = new Vector3f(-1, -1, -1); // -z
vert[1] = new Vector3f(1, -1, -1); // -z
vert[2] = new Vector3f(1, 1, -1); // -z
vert[3] = new Vector3f(-1, 1, -1); // -z
vert[4] = new Vector3f(1, -1, -1); // +x
vert[5] = new Vector3f(1, -1, 1); // +x
vert[6] = new Vector3f(1, 1, 1); // +x
vert[7] = new Vector3f(1, 1, -1); // +x
vert[8] = new Vector3f(1, -1, 1); // +z
vert[9] = new Vector3f(-1, -1, 1); // +z
vert[10] = new Vector3f(-1, 1, 1); // +z
vert[11] = new Vector3f(1, 1, 1); // +z
vert[12] = new Vector3f(-1, -1, 1); // -x
vert[13] = new Vector3f(-1, -1, -1); // -x
vert[14] = new Vector3f(-1, 1, -1); // -x
vert[15] = new Vector3f(-1, 1, 1); // -x
vert[16] = new Vector3f(1, 1, -1); // +y
vert[17] = new Vector3f(1, 1, 1); // +y
vert[18] = new Vector3f(-1, 1, 1); // +y
vert[19] = new Vector3f(-1, 1, -1); // +y
vert[20] = new Vector3f(-1, -1, -1); // -y
vert[21] = new Vector3f(-1, -1, 1); // -y
vert[22] = new Vector3f(1, -1, 1); // -y
vert[23] = new Vector3f(1, -1, -1); // -y
// *** 1. End
For the 24 vertex points, we have to give the normal. With the vertex information and normal information, all the 24 entries are now unique.
// *** 2. Start (Normals for the Verts)
Vector3f[] norm = new Vector3f[24];
norm[0] = new Vector3f(0, 0, -1); // -z
norm[1] = new Vector3f(0, 0, -1); // -z
norm[2] = new Vector3f(0, 0, -1); // -z
norm[3] = new Vector3f(0, 0, -1); // -z
norm[4] = new Vector3f(1, 0, 0); // +x
norm[5] = new Vector3f(1, 0, 0); // +x
norm[6] = new Vector3f(1, 0, 0); // +x
norm[7] = new Vector3f(1, 0, 0); // +x
norm[8] = new Vector3f(0, 0, 1); // +z
norm[9] = new Vector3f(0, 0, 1); // +z
norm[10] = new Vector3f(0, 0, 1); // +z
norm[11] = new Vector3f(0, 0, 1); // +z
norm[12] = new Vector3f(-1, 0, 0); // -x
norm[13] = new Vector3f(-1, 0, 0); // -x
norm[14] = new Vector3f(-1, 0, 0); // -x
norm[15] = new Vector3f(-1, 0, 0); // -x
norm[16] = new Vector3f(0, 1, 0); // +y
norm[17] = new Vector3f(0, 1, 0); // +y
norm[18] = new Vector3f(0, 1, 0); // +y
norm[19] = new Vector3f(0, 1, 0); // +y
norm[20] = new Vector3f(0, -1, 0); // -y
norm[21] = new Vector3f(0, -1, 0); // -y
norm[22] = new Vector3f(0, -1, 0); // -y
norm[23] = new Vector3f(0, -1, 0); // -y
// *** 2. End
Inside the program, we can create our UV mapping, based on the image. Here, the image was 3 by 2, and these divisions corresponds to the 6 faces.
// *** 3. Start (Texture coordinates for the Verts)
Vector2f [] texCoord = new Vector2f[24];
texCoord[0] = new Vector2f(0,0);
texCoord[1] = new Vector2f(THIRD,0);
texCoord[2] = new Vector2f(THIRD,0.5f);
texCoord[3] = new Vector2f(0,0.5f);
texCoord[4] = new Vector2f(THIRD,0);
texCoord[5] = new Vector2f(2*THIRD,0);
texCoord[6] = new Vector2f(2*THIRD,0.5f);
texCoord[7] = new Vector2f(THIRD,0.5f);
texCoord[8] = new Vector2f(2*THIRD,0);
texCoord[9] = new Vector2f(1,0);
texCoord[10] = new Vector2f(1,0.5f);
texCoord[11] = new Vector2f(2*THIRD,0.5f);
texCoord[12] = new Vector2f(0,0.5f);
texCoord[13] = new Vector2f(THIRD,0.5f);
texCoord[14] = new Vector2f(THIRD,1);
texCoord[15] = new Vector2f(0,1);
texCoord[16] = new Vector2f(THIRD,0.5f);
texCoord[17] = new Vector2f(2*THIRD,0.5f);
texCoord[18] = new Vector2f(2*THIRD,1);
texCoord[19] = new Vector2f(THIRD,1);
texCoord[20] = new Vector2f(2*THIRD,0.5f);
texCoord[21] = new Vector2f(1,0.5f);
texCoord[22] = new Vector2f(1,1);
texCoord[23] = new Vector2f(2*THIRD,1);
// *** 3. End
dice.png texture
For the 6 faces, we have to give the 12 counter clockwise triangles.
// *** 4. Start (// Indexes. 12 CCW Triangles)
int [] indexes = { 3,2,1, 1,0,3, // -z
7,6,5, 5,4,7, // +x
11,10,9, 9,8,11, // +z
15,14,13, 13,12,15, // -x
19,18,17, 17,16,19, // +y
23,22,21, 21,20,23 // -y
};
// *** 4. End
Now that we have the lists, we can create our mesh.
// *** 5. Start (Setting buffers)
m.setBuffer(Type.Position, 3, BufferUtils.createFloatBuffer(vert));
m.setBuffer(Type.Normal, 3, BufferUtils.createFloatBuffer(norm));
m.setBuffer(Type.TexCoord, 2, BufferUtils.createFloatBuffer(texCoord));
m.setBuffer(Type.Index, 1, BufferUtils.createIntBuffer(indexes));
m.updateBound();
// *** 5. End
We have to set the texture from external image file.
// *** 6. Start (Geometry, Material, Texture)
Geometry geom = new Geometry("DiceMesh", m);
Material mat = new Material(assetManager,
"Common/MatDefs/Light/Lighting.j3md");
Texture matTex = assetManager.loadTexture(
"Textures/dice.png");
mat.setTexture("DiffuseMap", matTex);
mat.setColor("Diffuse",ColorRGBA.Red);
mat.setColor("Specular",ColorRGBA.White);
mat.setFloat("Shininess", 32f); // [0,128]
geom.setMaterial(mat);
rootNode.attachChild(geom);
// *** 6. End
The lights have to illuminate the scene.
// *** 7. Start (Lights, Drag from Palette)
/** A white, directional light source */
DirectionalLight sun = new DirectionalLight();
sun.setDirection((new Vector3f(-0.5f, -0.5f, -0.5f)).normalizeLocal());
sun.setColor(ColorRGBA.White);
rootNode.addLight(sun); /** A white ambient light source. */
/** A cone-shaped spotlight with location, direction, range */
SpotLight spot = new SpotLight();
spot = new SpotLight();
spot.setSpotRange(100);
spot.setSpotOuterAngle(20 * FastMath.DEG_TO_RAD);
spot.setSpotInnerAngle(15 * FastMath.DEG_TO_RAD);
spot.setDirection(cam.getDirection());
spot.setPosition(cam.getLocation());
rootNode.addLight(spot);
AmbientLight ambient = new AmbientLight();
ambient.setColor(ColorRGBA.Red);
rootNode.addLight(ambient);
// *** 7. End
package mygame;
import com.jme3.app.SimpleApplication;
import com.jme3.light.AmbientLight;
import com.jme3.light.DirectionalLight;
import com.jme3.light.SpotLight;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Vector2f;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Mesh;
import com.jme3.scene.VertexBuffer.Type;
import com.jme3.system.AppSettings;
import com.jme3.texture.Texture;
import com.jme3.util.BufferUtils;
public class JMonkey32 extends SimpleApplication {
public static void main(String[] args){
AppSettings cfg = new AppSettings(true);
cfg.setFrameRate(60);
JMonkey32 app = new JMonkey32();
app.setSettings(cfg);
app.setDisplayFps(false);
app.setDisplayStatView(false);
app.start();
}
@Override
public void simpleInitApp() {
final float THIRD = 1f/3f;
Mesh m = new Mesh();
viewPort.setBackgroundColor(ColorRGBA.White);
flyCam.setEnabled(false);
// *** 1. Start (24 pts in cube with normal)
Vector3f [] vert = new Vector3f[24];
vert[0] = new Vector3f(-1, -1, -1); // -z
vert[1] = new Vector3f(1, -1, -1); // -z
vert[2] = new Vector3f(1, 1, -1); // -z
vert[3] = new Vector3f(-1, 1, -1); // -z
vert[4] = new Vector3f(1, -1, -1); // +x
vert[5] = new Vector3f(1, -1, 1); // +x
vert[6] = new Vector3f(1, 1, 1); // +x
vert[7] = new Vector3f(1, 1, -1); // +x
vert[8] = new Vector3f(1, -1, 1); // +z
vert[9] = new Vector3f(-1, -1, 1); // +z
vert[10] = new Vector3f(-1, 1, 1); // +z
vert[11] = new Vector3f(1, 1, 1); // +z
vert[12] = new Vector3f(-1, -1, 1); // -x
vert[13] = new Vector3f(-1, -1, -1); // -x
vert[14] = new Vector3f(-1, 1, -1); // -x
vert[15] = new Vector3f(-1, 1, 1); // -x
vert[16] = new Vector3f(1, 1, -1); // +y
vert[17] = new Vector3f(1, 1, 1); // +y
vert[18] = new Vector3f(-1, 1, 1); // +y
vert[19] = new Vector3f(-1, 1, -1); // +y
vert[20] = new Vector3f(-1, -1, -1); // -y
vert[21] = new Vector3f(-1, -1, 1); // -y
vert[22] = new Vector3f(1, -1, 1); // -y
vert[23] = new Vector3f(1, -1, -1); // -y
// *** 1. End
// *** 2. Start (Normals for the Verts)
Vector3f[] norm = new Vector3f[24];
norm[0] = new Vector3f(0, 0, -1); // -z
norm[1] = new Vector3f(0, 0, -1); // -z
norm[2] = new Vector3f(0, 0, -1); // -z
norm[3] = new Vector3f(0, 0, -1); // -z
norm[4] = new Vector3f(1, 0, 0); // +x
norm[5] = new Vector3f(1, 0, 0); // +x
norm[6] = new Vector3f(1, 0, 0); // +x
norm[7] = new Vector3f(1, 0, 0); // +x
norm[8] = new Vector3f(0, 0, 1); // +z
norm[9] = new Vector3f(0, 0, 1); // +z
norm[10] = new Vector3f(0, 0, 1); // +z
norm[11] = new Vector3f(0, 0, 1); // +z
norm[12] = new Vector3f(-1, 0, 0); // -x
norm[13] = new Vector3f(-1, 0, 0); // -x
norm[14] = new Vector3f(-1, 0, 0); // -x
norm[15] = new Vector3f(-1, 0, 0); // -x
norm[16] = new Vector3f(0, 1, 0); // +y
norm[17] = new Vector3f(0, 1, 0); // +y
norm[18] = new Vector3f(0, 1, 0); // +y
norm[19] = new Vector3f(0, 1, 0); // +y
norm[20] = new Vector3f(0, -1, 0); // -y
norm[21] = new Vector3f(0, -1, 0); // -y
norm[22] = new Vector3f(0, -1, 0); // -y
norm[23] = new Vector3f(0, -1, 0); // -y
// *** 2. End
// *** 3. Start (Texture coordinates for the Verts)
Vector2f [] texCoord = new Vector2f[24];
texCoord[0] = new Vector2f(0,0);
texCoord[1] = new Vector2f(THIRD,0);
texCoord[2] = new Vector2f(THIRD,0.5f);
texCoord[3] = new Vector2f(0,0.5f);
texCoord[4] = new Vector2f(THIRD,0);
texCoord[5] = new Vector2f(2*THIRD,0);
texCoord[6] = new Vector2f(2*THIRD,0.5f);
texCoord[7] = new Vector2f(THIRD,0.5f);
texCoord[8] = new Vector2f(2*THIRD,0);
texCoord[9] = new Vector2f(1,0);
texCoord[10] = new Vector2f(1,0.5f);
texCoord[11] = new Vector2f(2*THIRD,0.5f);
texCoord[12] = new Vector2f(0,0.5f);
texCoord[13] = new Vector2f(THIRD,0.5f);
texCoord[14] = new Vector2f(THIRD,1);
texCoord[15] = new Vector2f(0,1);
texCoord[16] = new Vector2f(THIRD,0.5f);
texCoord[17] = new Vector2f(2*THIRD,0.5f);
texCoord[18] = new Vector2f(2*THIRD,1);
texCoord[19] = new Vector2f(THIRD,1);
texCoord[20] = new Vector2f(2*THIRD,0.5f);
texCoord[21] = new Vector2f(1,0.5f);
texCoord[22] = new Vector2f(1,1);
texCoord[23] = new Vector2f(2*THIRD,1);
// *** 3. End
// *** 4. Start (// Indexes. 12 CCW Triangles)
int [] indexes = { 3,2,1, 1,0,3, // -z
7,6,5, 5,4,7, // +x
11,10,9, 9,8,11, // +z
15,14,13, 13,12,15, // -x
19,18,17, 17,16,19, // +y
23,22,21, 21,20,23 // -y
};
// *** 4. End
// *** 5. Start (Setting buffers)
m.setBuffer(Type.Position, 3, BufferUtils.createFloatBuffer(vert));
m.setBuffer(Type.Normal, 3, BufferUtils.createFloatBuffer(norm));
m.setBuffer(Type.TexCoord, 2, BufferUtils.createFloatBuffer(texCoord));
m.setBuffer(Type.Index, 1, BufferUtils.createIntBuffer(indexes));
m.updateBound();
// *** 5. End
// *** 6. Start (Geometry, Material, Texture)
Geometry geom = new Geometry("DiceMesh", m);
Material mat = new Material(assetManager,
"Common/MatDefs/Light/Lighting.j3md");
Texture matTex = assetManager.loadTexture(
"Textures/dice.png");
mat.setTexture("DiffuseMap", matTex);
mat.setColor("Diffuse",ColorRGBA.Red);
mat.setColor("Specular",ColorRGBA.White);
mat.setFloat("Shininess", 32f); // [0,128]
geom.setMaterial(mat);
rootNode.attachChild(geom);
// *** 6. End
// *** 7. Start (Lights, Drag from Palette)
/** A white, directional light source */
DirectionalLight sun = new DirectionalLight();
sun.setDirection((new Vector3f(-0.5f, -0.5f, -0.5f)).normalizeLocal());
sun.setColor(ColorRGBA.White);
rootNode.addLight(sun); /** A white ambient light source. */
/** A cone-shaped spotlight with location, direction, range */
SpotLight spot = new SpotLight();
spot = new SpotLight();
spot.setSpotRange(100);
spot.setSpotOuterAngle(20 * FastMath.DEG_TO_RAD);
spot.setSpotInnerAngle(15 * FastMath.DEG_TO_RAD);
spot.setDirection(cam.getDirection());
spot.setPosition(cam.getLocation());
rootNode.addLight(spot);
AmbientLight ambient = new AmbientLight();
ambient.setColor(ColorRGBA.Red);
rootNode.addLight(ambient);
// *** 7. End
}
@Override
public void simpleUpdate(float tpf) {
// Rotation per frame
rootNode.rotate(.005f,.01f,.008f);
}
}
Output:
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