[JAVA3D] 3DS importer supporting Chunk 0x4160 ?

[Andreas Jerke]

Hi All,

I have testet several importers for 3DS files and
all don`t support correct reading of chunk 0x4160 .
This chunk contains 12 float values describing an
4*3 matrix, with which all vertices of an object
must be transformed.

Most 3DS files exported from 3DSMax contain this chunk.

Me problem is, that the objects in my imported 3DS scene
are not in the correct position/scaling/rotation.

I tried to implement this chunk in the
org.opentools.java3d.ThreeDSProcessor.class ,
but I get wrong results.

Does anyone know how to transform all vertices with
the matrix ?

Does anyone know which 3DS importer supports 0x4160 ?


Best regards,
Andreas



extension to org.opentools.java3d.ThreeDSProcessor from
Aaron Mulder's 3DS Loader,
http://www.j3d.org/utilities/loaders/3ds/mulder.html

<schnipp>
[...]


                case TYPE_MESH_MATRIX:
                    //offset for this object !
                    float rmatrix[] = new float[16];

                          //read rotate/scale matrix (CORRECT ORDER ???)
                    rmatrix[0]=readFloat();
                    rmatrix[3]=readFloat();
                    rmatrix[6]=readFloat();

                    rmatrix[1]=readFloat();
                    rmatrix[4]=readFloat();
                    rmatrix[7]=readFloat();

                    rmatrix[2]=readFloat();
                    rmatrix[5]=readFloat();
                    rmatrix[8]=readFloat();

                          //read transformation vector
                    Point3f trans = new
Point3f(readFloat(),readFloat(),readFloat());

                    Matrix3f matrix = new Matrix3f(rmatrix);
                    debug("Transform all vertices with matrix
\n"+matrix);

                          //center of current object, calculated from
bounding box (DO I NEED THIS ???)
                    Point3f center = new Point3f(
                            -((omaxx-ominx)/2+ominx),
                            -((omaxy-ominy)/2+ominy),
                            -((omaxz-ominz)/2+ominz)
                        );
                    //transform all vertices, >BUGGY<
                    for (int i=0; i<vertices.length; i++) {
                        debug("before:"+vertices[i].toString());
                        vertices[i].add(center);
                        matrix.transform(vertices[i]);
                        vertices[i].add(trans);

                        debug("after:"+vertices[i].toString());
                    }
                    break;


</schnapp>

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