Post by mariog on Oct 10, 2019 13:45:02 GMT
Hi,
I'm probably doing something obviously wrong but I don't seem to be able to translate a pattern. I was getting the same problem with a gradient pattern as another member posted to the forum and I saw Jamis's reply in which he recommended that you scale the pattern by 2 and then translate it in x by -1. I have done this. The scale works, but the pattern won't translate and the tests all check out okay. Here's my code for the abstract pattern class that handles the point transformations from world space to object space:
public abstract class Pattern {
Matrix transform;
public Pattern() {
transform = new Matrix(4,4).identity();
}
public Colour patternAtObject(Shape shape, Tuple worldPoint) {
Tuple shapePoint = shape.transform.inverse().mult(worldPoint);
Tuple patternPoint = transform.inverse().mult(shapePoint);
return patternAt(patternPoint);
}
public abstract Colour patternAt(Tuple point);
}
Matrix transform;
public Pattern() {
transform = new Matrix(4,4).identity();
}
public Colour patternAtObject(Shape shape, Tuple worldPoint) {
Tuple shapePoint = shape.transform.inverse().mult(worldPoint);
Tuple patternPoint = transform.inverse().mult(shapePoint);
return patternAt(patternPoint);
}
public abstract Colour patternAt(Tuple point);
}
I've added the image I have rendered as an attachment. It has been correctly scaled by 2 in x, y and z:
Thanks for any help you can provide,
--Mario
Attachments:
