Hi!
I have approximately the following code creating an object I load from
file. From the file I get a list of vertices with coordinates, normals
and texture coordinates. I also get a list of triangles with references
to 3 vertices in that list, a color for the triangle and a path to the
texture used. With the following code I got everything to work with
textures and all. The problem is performance.
//////////////////////////////////////////////////////////////// Start
of code ////////////////////////////////////////////////
// Create an array of independant triangles
TriangleArray[] myTriangles = new TriangleArray[numTriangles];
for (int i = 0; i < numTriangles; i++) {
// Create this specific triangle
myTriangles[i] = new TriangleArray(3, TriangleArray.COORDINATES |
TriangleArray.COLOR_3 |
TriangleArray.TEXTURE_COORDINATE_2 );
// Loop through the vertices for this triangle
for (int vtx = 0; vtx < 3; vtx++) {
// Set the coordinate
myTriangles[i].setCoordinate(vtx, new Point3d(getXinSomeWay,
getYinSomeWay, getZinSomeWay));
// Set the texture coordinate
texCoords[0] = getUinSomeWay;
texCoords[1] = getVinSomeWay;
myTriangles[i].setTextureCoordinate(vtx, texCoords);
}
// Set the color for this triangle
myTriangles[i].setColors(0, getTriangleColorInSomeWay);
// Specify the texture
TriangleAppear = new Appearance();
TriangleAppear.setTexture(textureArray[idxInTextureArray]);
TriangleAppear.setTextureAttributes(textureAttrArray[idxInTextureAttrArray]);
// Add the triangle to the scene graph
objRoot.addChild(new Shape3D(myTriangles[i], TriangleAppear));
// Continue with next
}
//////////////////////////////////////////////////////////////// End of
code ////////////////////////////////////////////////
Now I'm trying to optimize my code. So I thought about using an
IndexedTriangleArray to be able to reuse the vertices and that way
getting better performance. With the following code I get it to work
without color and textures. And it runs considerably faster.
//////////////////////////////////////////////////////////////// Start
of code ////////////////////////////////////////////////
// Create the indexed triangle array with
IndexedTriangleArray myTriangles = new IndexedTriangleArray(numVtx,
GeometryArray.COORDINATES,
numTriangles*3);
// Set all the vertex coordinates
for (int vi = 0; vi < numVtx; vi++)
myTriangles.setCoordinate(vi, new Point3d(vertexList[vi].x,
vertexList[vi].x, vertexList[vi].z) );
// Specify vertex indices for each triangle
for (int f = 0; f < numTriangles; f++)
for (int v = 0; v < 3; v++)
myTriangles.setCoordinateIndex(f*3+v,
triangleList[f].vtxList[v]);
// Add the triangles to the scene graph
objRoot.addChild(new Shape3D(myTriangles, null));
//////////////////////////////////////////////////////////////// End of
code ////////////////////////////////////////////////
But the problem is that I want to specify a color for each triangle and
not per vertex. Also I want separate textures
for each triangle but I only can have one Apperance for the whole
Shape3D. What do I do?
I'm pretty new to Java/Java3D so maybe I have misunderstood something;
so please enlight me!!
Thanks in advance!
/Per Burstrom, Sweden
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