[英]How can I convert 3D coordinates
我想將OBJ文件的3D坐標轉換為[0..1],因此可以使用Java3D繪制它們。 這是我的嘗試:
private BranchGroup drawFDPS() {
BranchGroup lineGroup = new BranchGroup();
Appearance app = new Appearance();
ColoringAttributes ca = new ColoringAttributes(new Color3f(.0f, 204.0f, .0f), ColoringAttributes.SHADE_FLAT);
app.setColoringAttributes(ca);
Point3f[] plaPts = new Point3f[4];
int count = 0;
// this is just for testing...
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
plaPts[count] = new Point3f(i / 10.0f, j / 10.0f, 0);
count++;
}
}
PointArray pla = new PointArray(4, GeometryArray.COORDINATES);
pla.setCoordinates(0, plaPts);
// between here!
PointAttributes a_point_just_bigger = new PointAttributes();
a_point_just_bigger.setPointSize(10.0f);// 10 pixel-wide point
a_point_just_bigger.setPointAntialiasingEnable(true);
app.setPointAttributes(a_point_just_bigger);
// and here! sets the point-attributes so it is easily seen.
...
return lineGroup;
}
大家好,我已經實施了一個解決方案。 我遍歷所有頂點並搜索模型的6個極限,然后根據極限對所有坐標進行歸一化。 這是我的實現:
private Vector3f[] getLimits() {
Vector3f currentVertex = new Vector3f();
// Find the limits of the model
Vector3f[] limit = new Vector3f[2];
limit[0] = new Vector3f(Float.MAX_VALUE, Float.MAX_VALUE, Float.MAX_VALUE);
limit[1] = new Vector3f(Float.MIN_VALUE, Float.MIN_VALUE, Float.MIN_VALUE);
for (int i = 0; i < positions.size(); i++) {
currentVertex = positions.get(i);
// Keep track of limits for normalization
if (currentVertex.getX() < limit[0].getX())
limit[0].setX(currentVertex.getX());
if (currentVertex.getX() > limit[1].getX())
limit[1].setX(currentVertex.getX());
if (currentVertex.getY() < limit[0].getY())
limit[0].setY(currentVertex.getY());
if (currentVertex.getY() > limit[1].getY())
limit[1].setY(currentVertex.getY());
if (currentVertex.getZ() < limit[0].getZ())
limit[0].setZ(currentVertex.getZ());
if (currentVertex.getZ() > limit[1].getZ())
limit[1].setZ(currentVertex.getZ());
}
return limit;
} // End of getLimits
然后,我使用這些限制對所有頂點進行歸一化,因此它們的坐標在[-1..1]之間,並且它們將正確顯示在屏幕上^^這是歸一化方法:
private void normalize() {
Vector3f[] limits = getLimits();
for(int i = 0; i < positions.size(); i++) {
if(positions.get(i).getX() >= 0) {
positions.get(i).setX(positions.get(i).getX() / limits[1].getX());
} else {
positions.get(i).setX(Math.abs(positions.get(i).getX()) / limits[0].getX());
}
if(positions.get(i).getY() >= 0) {
positions.get(i).setY(positions.get(i).getY() / limits[1].getY());
} else {
positions.get(i).setY(Math.abs(positions.get(i).getY()) / limits[0].getY());
}
if(positions.get(i).getZ() >= 0) {
positions.get(i).setZ(positions.get(i).getZ() / limits[1].getZ());
} else {
positions.get(i).setZ(Math.abs(positions.get(i).getZ()) / limits[0].getZ());
}
}
}
任何反饋都歡迎你們薩拉姆
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