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Support normals and textures for triangulated faces

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This commit is contained in:
SiboVG 2024-02-13 23:29:18 +01:00
parent 17bc98b54f
commit 30e49e1929
1 changed files with 55 additions and 2 deletions
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57
core/src/net/sf/openrocket/file/wavefrontobj/TriangulationHelper.java
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@ -84,6 +84,10 @@ public abstract class TriangulationHelper {
* @return A list of generated object faces representing the triangulated faces.
*/
public static List<ObjFace> generateCDTFaces(DefaultObj obj, DefaultObjFace face) {
// Retrieve the vertex mapping to normal indices and texture coordinate indices
Map<Integer, Integer> vertexToNormalMap = mapVertexIndicesToNormalIndices(face);
Map<Integer, Integer> vertexToTexCoordMap = mapVertexIndicesToTexCoordIndices(face);
// Calculate the face normal
Coordinate normal = vertexToCoordinate(ObjUtils.calculateNormalVector(
obj.getVertex(face.getVertexIndices()[0]),
@ -125,8 +129,16 @@ public abstract class TriangulationHelper {
// Add the new face to the list
if (vertexIndices[0] != -1 && vertexIndices[1] != -1 && vertexIndices[2] != -1) {
// TODO: Add support for texture coordinates and normals (create a new map to map vertex index and normal/texcoord index)
DefaultObjFace newFace = new DefaultObjFace(vertexIndices, null, null);
// Map the vertex indices to normal and texture coordinate indices
int[] normalIndices = vertexToNormalMap != null ?
new int[] {vertexToNormalMap.get(vertexIndices[0]), vertexToNormalMap.get(vertexIndices[1]), vertexToNormalMap.get(vertexIndices[2])}
: null;
int[] texCoordIndices = vertexToTexCoordMap != null ?
new int[] {vertexToTexCoordMap.get(vertexIndices[0]), vertexToTexCoordMap.get(vertexIndices[1]), vertexToTexCoordMap.get(vertexIndices[2])}
: null;
// Create and add the new face
DefaultObjFace newFace = new DefaultObjFace(vertexIndices, texCoordIndices, normalIndices);
newFaces.add(newFace);
}
}
@ -197,6 +209,47 @@ public abstract class TriangulationHelper {
return new Coordinate(x2D, y2D);
}
/**
* Maps the vertex indices of a face to the normal indices of the same face.
*
* @param face The face for which to map the vertex indices to normal indices.
* @return A map that maps the vertex indices to the normal indices, or null if the face does not contain normal indices.
*/
private static Map<Integer, Integer> mapVertexIndicesToNormalIndices(DefaultObjFace face) {
int[] normalIndices = face.getNormalIndices();
if (normalIndices == null) {
return null;
}
Map<Integer, Integer> vertexToNormalMap = new HashMap<>();
int[] vertexIndices = face.getVertexIndices();
for (int i = 0; i < vertexIndices.length; i++) {
vertexToNormalMap.put(vertexIndices[i], normalIndices[i]);
}
return vertexToNormalMap;
}
/**
* Maps vertex indices to texture coordinate indices.
*
* @param face The face object containing the vertex and texture coordinate indices.
* @return A map that maps vertex indices to texture coordinate indices, or null if the face does
* not contain texture coordinate indices.
*/
private static Map<Integer, Integer> mapVertexIndicesToTexCoordIndices(DefaultObjFace face) {
int[] texCoordIndices = face.getTexCoordIndices();
if (texCoordIndices == null) {
return null;
}
Map<Integer, Integer> vertexToTexCoordMap = new HashMap<>();
int[] vertexIndices = face.getVertexIndices();
for (int i = 0; i < vertexIndices.length; i++) {
vertexToTexCoordMap.put(vertexIndices[i], texCoordIndices[i]);
}
return vertexToTexCoordMap;
}
/**
* Computes the cross product of two vectors.
*