# Perform a AABB hit test in 3D
**URL:** https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319
**Category:** Coding Questions
**Created:** [January 8, 2019, 12:51pm UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319 "2019-01-08T12:51:07Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@clankill3r](https://discourse.processing.org/u/clankill3r)
#### Post date: [January 8, 2019, 12:51pm UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319/1 "2019-01-08T12:51:08Z")
Is it possible to do a point hit test on a axis aligned bounding box after things like rotation are applied?
Here is one of my current attempts, but i’m not sure if i’m after something that is possible at all.
```java
int w = 200;
int h = 200;
void setup() {
size(600, 600, P3D);
}
void draw() {
background(30);
pushMatrix();
translate(width/2, height/2);
rotateY(radians(45));
fill(255);
rect(0, 0, w, h);
PVector p1 = new PVector(modelX(0, 0, 0), modelY(0, 0, 0), modelZ(0, 0, 0));
PVector p2 = new PVector(modelX(w, 0, 0), modelY(w, 0, 0), modelZ(w, 0, 0));
PVector p3 = new PVector(modelX(w, h, 0), modelY(w, h, 0), modelZ(w, h, 0));
PVector p4 = new PVector(modelX(0, h, 0), modelY(0, h, 0), modelZ(0, h, 0));
PVector mouse = new PVector(modelX(mouseX-width/2, mouseY-height/2, 0),
modelY(mouseX-width/2, mouseY-height/2, 0),
modelZ(mouseX-width/2, mouseY-height/2, 0));
PMatrix3D m = (PMatrix3D) getMatrix();
m.invert();
popMatrix();
// -------------------------------------------------------------
PVector c1 = m.mult(p1, null);
PVector c2 = m.mult(p2, null);
PVector c3 = m.mult(p3, null);
PVector c4 = m.mult(p4, null);
PVector cm = m.mult(mouse, null);
pushMatrix();
beginShape();
translate(width*0.4, 0);
noFill();
stroke(255);
vertex(c1.x, c1.y);
vertex(c2.x, c2.y);
vertex(c3.x, c3.y);
vertex(c4.x, c4.y);
endShape(CLOSE);
ellipse(cm.x, cm.y, 10, 10);
popMatrix();
}
```
---
### Author:  [@BennyHacker](https://discourse.processing.org/u/BennyHacker)
#### Post date: [January 8, 2019, 7:59pm UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319/2 "2019-01-08T19:59:53Z")
This is not a complete answer but collisions with rotated cubes can be quite difficult and require quite a bit of knowledge about trigonometry. I’d start by drawing sketches of cubes only rotating in one axis and try to find easier solutions based on that. One method I came up with was checking if the point collides with a 2D polygon made from the 4 top or bottom points, then checking to see if the collision is inside of the y range of that cube
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### Author:  [@clankill3r](https://discourse.processing.org/u/clankill3r)
#### Post date: [January 8, 2019, 10:44pm UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319/3 "2019-01-08T22:44:09Z")
Yeah in 2d I cn do that using the inverse matrix.
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### Author:  [@BennyHacker](https://discourse.processing.org/u/BennyHacker)
#### Post date: [January 8, 2019, 11:53pm UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319/4 "2019-01-08T23:53:37Z")
Did you get it working?
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### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [January 9, 2019, 9:42am UTC](https://discourse.processing.org/t/perform-a-aabb-hit-test-in-3d/7319/5 "2019-01-09T09:42:47Z")
It is most unlikely that you can do that because you can only get 2 coordinates with the mouse and there is no way to get the third coordinate to specify a 3D position. The best you can get is a 3D vector of the direction you are looking and use ray-tracing to see if it intersects the quad.