Économisez 3D Mailles dans un format binaire personnalisé

Aspose.3D for Java API a le support d’ouvrir tout document 3D pris en charge, puis d’écrire des maillages dans le fichier binaire.

Charger 3D Fichier et écrire des maillages dans un exemple de programmation au format binaire personnalisé

Accept méthode exposée par le membre RootNode dans la classe Scene permet de visiter chaque sous-nœud. L’extrait de code ci-dessous permet de convertir uniquement les maillages.

// The path to the documents directory.
String MyDir = RunExamples.getDataDir();
// load a 3D file
Scene scene = new Scene(MyDir + "test.fbx");
/*
* 3D format demonstration is simple
*
* struct File {
*   MeshBlock blocks[];
* };
*
* struct Vertex {
*   float x;
*   float y;
*   float z;
* };
*
* struct Triangle {
*   int a;
*   int b;
*   int c;
* };
*
* struct MeshBlock {
*   int numControlPoints;
*   int numTriangles;
*   Vertex vertices[numControlPoints];
*   Triangle faces[numTriangles];
* };
*/
// open file for writing in binary mode
try (DataOutputStream writer = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(MyDir + "Save3DMeshesInCustomBinaryFormat_out"))))
{
    // visit each descent nodes
    scene.getRootNode().accept(new NodeVisitor(){
        @Override
        public boolean call(Node node) {
            try {
                for (Entity entity : node.getEntities()) {
                // only convert meshes, lights/camera and other stuff will be ignored
                if (!(entity instanceof IMeshConvertible))
                    continue;
                Mesh m = ((IMeshConvertible) entity).toMesh();
                List<Vector4> controlPoints = m.getControlPoints();
                // triangulate the mesh, so triFaces will only store triangle indices
                int[][] triFaces = PolygonModifier.triangulate(controlPoints, m.getPolygons());
                // gets the global transform matrix
                Matrix4 transform = node.getGlobalTransform().getTransformMatrix();
                // write number of control points and triangle indices
                writer.writeInt(controlPoints.size());
                writer.writeInt(triFaces.length);
                // write control points
                for (int i = 0; i < controlPoints.size(); i++) {
                    // calculate the control points in world space and save them to file
                    Vector4 cp = Matrix4.mul(transform, controlPoints.get(i));
                    writer.writeFloat((float) cp.x);
                    writer.writeFloat((float) cp.y);
                    writer.writeFloat((float) cp.z);
                }
                // write triangle indices
                for (int i = 0; i < triFaces.length; i++) {
                    writer.writeInt(triFaces[i][0]);
                    writer.writeInt(triFaces[i][1]);
                    writer.writeInt(triFaces[i][2]);
                }
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
        return true;
    }
});
}