I
Well, spatials and nodes don't have any geometry information, it is only when you get to TriMesh that the vertexes and tex-coords, etc are available. In the end, in jME 1.0 and before, you need to extract this info from a GeomBatch but typically TriMeshes only have one of them, so you can access it directly.
Here's some converter I made a while ago… not sure if it works and for what reason I made it exactly. It's for pre 1.0 jME version.
package com.gibbon.mfkarpg.model;
import com.jme.image.Texture;
import com.jme.math.Vector3f;
import com.jme.renderer.ColorRGBA;
import com.jme.scene.Node;
import com.jme.scene.Spatial;
import com.jme.scene.TriMesh;
import com.jme.scene.state.AlphaState;
import com.jme.scene.state.LightState;
import com.jme.scene.state.MaterialState;
import com.jme.scene.state.RenderState;
import com.jme.scene.state.TextureState;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
/**
* Converts jME scenes to an OBJ model
* @author MomokoFan
*/
public class JmeToObj {
protected JmeToObj() {
}
public static void convert(Spatial scene, File folder) throws IOException{
File objf = new File(folder,scene.getName()+".obj");
File mtlf = new File(folder,scene.getName()+".mtl");
BufferedWriter objw = new BufferedWriter(new FileWriter(objf));
BufferedWriter mtlw = new BufferedWriter(new FileWriter(mtlf));
objw.append("# Generated by JmeToObjrnrn");
objw.append("mtllib "+scene.getName()+".mtlrn");
dumpSpatial(scene, objw, mtlw);
}
private static final String f2s(float f){
return Float.toString(f);
}
public static boolean dumpMaterial(Spatial source, BufferedWriter writer) throws IOException{
boolean hasMat = false;
MaterialState ms = (MaterialState) source.getRenderState(RenderState.RS_MATERIAL);
ColorRGBA color;
if (ms != null){
writer.append("newmtl "+source.getName());
hasMat = true;
color = ms.getAmbient();
writer.append("Ka ")
.append(f2s(color.r)).append(' ')
.append(f2s(color.g)).append(' ')
.append(f2s(color.b)).append("rn");
color = ms.getDiffuse();
writer.append("Kd ")
.append(f2s(color.r)).append(' ')
.append(f2s(color.g)).append(' ')
.append(f2s(color.b)).append("rn");
color = ms.getSpecular();
writer.append("Ks ")
.append(f2s(color.r)).append(' ')
.append(f2s(color.g)).append(' ')
.append(f2s(color.b)).append("rn");
writer.append("Ns ")
.append(f2s(ms.getShininess())).append("rn");
}
AlphaState as = (AlphaState) source.getRenderState(RenderState.RS_ALPHA);
if (as != null){
if (!hasMat){
writer.append("newmtl "+source.getName()+"rn");
hasMat = true;
}
writer.append("illum 9rn");
if (ms != null)
writer.append("d ").append(f2s(ms.getAmbient().a * ms.getDiffuse().a * ms.getEmissive().a));
}else if (source.getLightCombineMode() != LightState.OFF){
if (hasMat) writer.append("illum 2rn");
}else{
if (!hasMat){
writer.append("newmtl "+source.getName()+"rn");
hasMat = true;
}
writer.append("illum 0rn");
}
TextureState ts = (TextureState) source.getRenderState(RenderState.RS_TEXTURE);
if (ts != null && ts.getTexture(0)!=null && ts.getTexture(0).getImageLocation()!=null){
if (!hasMat){
writer.append("newmtl "+source.getName()+"rn");
hasMat = true;
}
Texture t = ts.getTexture(0);
URL url = new URL(t.getImageLocation());
writer.append("map_Kd ");
if (t.getTranslation()!=null){
writer.append("-o "+t.getTranslation().x+" "+t.getTranslation().y+" ");
}
if (t.getScale()!=null){
writer.append("-s "+t.getScale().x+" "+t.getScale().y+" ");
}
if (t.getWrap()==Texture.WM_BCLAMP_S_BCLAMP_T
|| t.getWrap()==Texture.WM_CLAMP_S_CLAMP_T
|| t.getWrap()==Texture.WM_ECLAMP_S_ECLAMP_T){
writer.append("-clamp on");
}
writer.append(url.getPath()).append("rn");
}
if (hasMat)
writer.newLine();
return hasMat;
}
public static void dumpSpatial(Spatial spat, BufferedWriter objs, BufferedWriter mtls) throws IOException{
if (spat instanceof TriMesh){
boolean mat = dumpMaterial(spat, mtls);
dumpMesh((TriMesh)spat, mat, objs);
}else if (spat instanceof Node){
Node n = (Node)spat;
if (n.getChildren() == null)
return;
for (Spatial s: n.getChildren()){
dumpSpatial(s, objs, mtls);
}
}
}
public static void dumpMesh(TriMesh mesh, boolean hasMaterial, BufferedWriter writer) throws IOException{
FloatBuffer vb = mesh.getVertexBuffer(0);
FloatBuffer nb = mesh.getNormalBuffer(0);
FloatBuffer tb = mesh.getTextureBuffer(0, 0);
IntBuffer ib = mesh.getIndexBuffer(0);
int len;
Vector3f temp = new Vector3f();
writer.append("o "+mesh.getName()).append("rn");
Spatial s = mesh;
writer.append("g ");
while (s != null){
writer.append(s.getName());
s = s.getParent();
if (s != null) writer.append(' ');
}
writer.append("rn");
// Vertex data
if (vb!=null){
len = vb.limit() / 3;
vb.rewind();
for (int i = 0; i < len; i++ ){
temp.set(vb.get(), vb.get(), vb.get());
mesh.localToWorld(temp, temp);
writer.append("v ")
.append(Float.toString(temp.x))
.append(' ')
.append(Float.toString(temp.y))
.append(' ')
.append(Float.toString(temp.z))
.append("rn");
}
writer.append("rn");
}
// Texture coordinates
if (tb!=null){
len = tb.limit() / 2;
tb.rewind();
for (int i = 0; i < len; i++){
float x = tb.get(), y = tb.get();
writer.append("vt ")
.append(Float.toString(x))
.append(' ')
.append(Float.toString(y))
.append("rn");
}
writer.append("rn");
}
// Normals
if (nb!=null){
len = nb.limit() / 3;
nb.rewind();
for (int i = 0; i < len; i++ ){
temp.set(nb.get(), nb.get(), nb.get());
mesh.getWorldRotation().mult(temp, temp);
writer.append("vn ")
.append(Float.toString(temp.x))
.append(' ')
.append(Float.toString(temp.y))
.append(' ')
.append(Float.toString(temp.z))
.append("rn");
}
writer.append("rn");
}
if (hasMaterial){
writer.append("usemtl ").append(mesh.getName()).append("rn");
}
// Face Indexes
if (ib!=null){
len = ib.limit() / 3;
ib.rewind();
for (int i = 0; i < len; i++){
String v1 = Integer.toString(ib.get()+1), v2 = Integer.toString(ib.get()+1), v3 = Integer.toString(ib.get()+1);
if (tb!=null && nb==null){
writer.append("f ")
.append(v1).append("/").append(v1)
.append(' ')
.append(v2).append("/").append(v2)
.append(' ')
.append(v3).append("/").append(v3)
.append("rn");
}else if (tb==null && nb!=null){
writer.append("f ")
.append(v1).append("//").append(v1)
.append(' ')
.append(v2).append("//").append(v2)
.append(' ')
.append(v3).append("//").append(v3)
.append("rn");
}else if (tb!=null && nb!=null){
writer.append("f ")
.append(v1).append("/").append(v1).append("/").append(v1)
.append(' ')
.append(v2).append("/").append(v2).append("/").append(v2)
.append(' ')
.append(v3).append("/").append(v3).append("/").append(v3)
.append("rn");
}else{
writer.append("f ")
.append(v1)
.append(' ')
.append(v2)
.append(' ')
.append(v3)
.append("rn");
}
}
writer.append("rn");
}
}
}
u have a good method here, i
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vn -0.16244379 -0.9825666 0.09041496
...
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vn 0.9013937 0.29438153 0.31753567
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no indexes and several points with the same coordinates.