package com.jme3.scene.plugins.blender.modifiers;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.jme3.math.Matrix4f;
import com.jme3.math.Vector3f;
import com.jme3.scene.Node;
import com.jme3.scene.plugins.blender.BlenderContext;
import com.jme3.scene.plugins.blender.file.BlenderFileException;
import com.jme3.scene.plugins.blender.file.Pointer;
import com.jme3.scene.plugins.blender.file.Structure;
import com.jme3.scene.plugins.blender.meshes.Edge;
import com.jme3.scene.plugins.blender.meshes.Face;
import com.jme3.scene.plugins.blender.meshes.TemporalMesh;
import com.jme3.scene.plugins.blender.objects.ObjectHelper;
/**
* This modifier allows to array modifier to the object.
*
* @author Marcin Roguski (Kaelthas)
*/
/* package */class MirrorModifier extends Modifier {
private static final Logger LOGGER = Logger.getLogger(MirrorModifier.class.getName());
private static final int FLAG_MIRROR_X = 0x08;
private static final int FLAG_MIRROR_Y = 0x10;
private static final int FLAG_MIRROR_Z = 0x20;
private static final int FLAG_MIRROR_U = 0x02;
private static final int FLAG_MIRROR_V = 0x04;
private static final int FLAG_MIRROR_VERTEX_GROUP = 0x40;
private static final int FLAG_MIRROR_MERGE = 0x80;
private boolean[] isMirrored;
private boolean mirrorU, mirrorV;
private boolean merge;
private float tolerance;
private Pointer pMirrorObject;
private boolean mirrorVGroup;
/**
* This constructor reads mirror data from the modifier structure. The
* stored data is a map of parameters for mirror modifier. No additional data
* is loaded.
* When the modifier is applied it is necessary to get the newly created node.
*
* @param objectStructure
* the structure of the object
* @param modifierStructure
* the structure of the modifier
* @param blenderContext
* the blender context
* @throws BlenderFileException
* this exception is thrown when the blender file is somehow
* corrupted
*/
public MirrorModifier(Structure modifierStructure, BlenderContext blenderContext) {
if (this.validate(modifierStructure, blenderContext)) {
int flag = ((Number) modifierStructure.getFieldValue("flag")).intValue();
isMirrored = new boolean[] { (flag & FLAG_MIRROR_X) != 0, (flag & FLAG_MIRROR_Y) != 0, (flag & FLAG_MIRROR_Z) != 0 };
if (blenderContext.getBlenderKey().isFixUpAxis()) {
boolean temp = isMirrored[1];
isMirrored[1] = isMirrored[2];
isMirrored[2] = temp;
}
mirrorU = (flag & FLAG_MIRROR_U) != 0;
mirrorV = (flag & FLAG_MIRROR_V) != 0;
mirrorVGroup = (flag & FLAG_MIRROR_VERTEX_GROUP) != 0;
merge = (flag & FLAG_MIRROR_MERGE) == 0;// in this case we use == instead of != (this is not a mistake)
tolerance = ((Number) modifierStructure.getFieldValue("tolerance")).floatValue();
pMirrorObject = (Pointer) modifierStructure.getFieldValue("mirror_ob");
if (mirrorVGroup) {
LOGGER.warning("Mirroring vertex groups is currently not supported.");
}
}
}
@Override
public void apply(Node node, BlenderContext blenderContext) {
if (invalid) {
LOGGER.log(Level.WARNING, "Mirror modifier is invalid! Cannot be applied to: {0}", node.getName());
} else {
TemporalMesh temporalMesh = this.getTemporalMesh(node);
if (temporalMesh != null) {
LOGGER.log(Level.FINE, "Applying mirror modifier to: {0}", temporalMesh);
Vector3f mirrorPlaneCenter = new Vector3f();
if (pMirrorObject.isNotNull()) {
Structure objectStructure;
try {
objectStructure = pMirrorObject.fetchData().get(0);
ObjectHelper objectHelper = blenderContext.getHelper(ObjectHelper.class);
Node object = (Node) objectHelper.toObject(objectStructure, blenderContext);
if (object != null) {
// compute the mirror object coordinates in node's local space
mirrorPlaneCenter = this.getWorldMatrix(node).invertLocal().mult(object.getWorldTranslation());
}
} catch (BlenderFileException e) {
LOGGER.log(Level.SEVERE, "Cannot load mirror''s reference object. Cause: {0}", e.getLocalizedMessage());
LOGGER.log(Level.SEVERE, "Mirror modifier will not be applied to node named: {0}", node.getName());
return;
}
}
LOGGER.finest("Allocating temporal variables.");
float d;
Vector3f mirrorPlaneNormal = new Vector3f();
Vector3f shiftVector = new Vector3f();
LOGGER.fine("Mirroring mesh.");
for (int mirrorIndex = 0; mirrorIndex < 3; ++mirrorIndex) {
if (isMirrored[mirrorIndex]) {
boolean mirrorAtPoint0 = mirrorPlaneCenter.get(mirrorIndex) == 0;
if (!mirrorAtPoint0) {// compute mirror's plane normal vector in node's space
mirrorPlaneNormal.set(0, 0, 0).set(mirrorIndex, Math.signum(mirrorPlaneCenter.get(mirrorIndex)));
}
TemporalMesh mirror = temporalMesh.clone();
for (int i = 0; i < mirror.getVertexCount(); ++i) {
Vector3f vertex = mirror.getVertices().get(i);
Vector3f normal = mirror.getNormals().get(i);
if (mirrorAtPoint0) {
d = Math.abs(vertex.get(mirrorIndex));
shiftVector.set(0, 0, 0).set(mirrorIndex, -vertex.get(mirrorIndex));
} else {
d = this.computeDistanceFromPlane(vertex, mirrorPlaneCenter, mirrorPlaneNormal);
mirrorPlaneNormal.mult(d, shiftVector);
}
if (merge && d <= tolerance) {
vertex.addLocal(shiftVector);
normal.set(mirrorIndex, 0);
temporalMesh.getVertices().get(i).addLocal(shiftVector);
temporalMesh.getNormals().get(i).set(mirrorIndex, 0);
} else {
vertex.addLocal(shiftVector.multLocal(2));
normal.set(mirrorIndex, -normal.get(mirrorIndex));
}
}
// flipping the indexes
for (Face face : mirror.getFaces()) {
face.flipIndexes();
}
for (Edge edge : mirror.getEdges()) {
edge.flipIndexes();
}
Collections.reverse(mirror.getPoints());
if (mirrorU || mirrorV) {
for (Face face : mirror.getFaces()) {
face.flipUV(mirrorU, mirrorV);
}
}
temporalMesh.append(mirror);
}
}
} else {
LOGGER.log(Level.WARNING, "Cannot find temporal mesh for node: {0}. The modifier will NOT be applied!", node);
}
}
}
/**
* Fetches the world matrix transformation of the given node.
* @param node
* the node
* @return the node's world transformation matrix
*/
private Matrix4f getWorldMatrix(Node node) {
Matrix4f result = new Matrix4f();
result.setTranslation(node.getWorldTranslation());
result.setRotationQuaternion(node.getWorldRotation());
result.setScale(node.getWorldScale());
return result;
}
/**
* The method computes the distance between a point and a plane (described by point in space and normal vector).
* @param p
* the point in the space
* @param c
* mirror's plane center
* @param n
* mirror's plane normal (should be normalized)
* @return the minimum distance from point to plane
*/
private float computeDistanceFromPlane(Vector3f p, Vector3f c, Vector3f n) {
return Math.abs(n.dot(p) - c.dot(n));
}
}