private Vector3f terraionCollision(float x, float y, Ray ray) {
y /= 2f;
x /= 2f;
int xInt = (int) x;
int yInt = (int) y;
// p1-----p2
// || ||
// || ||
// p3-----p4
float p1, p2, p3, p4;
if (terrainData.length == 1) {
p1 = p2 = p3 = p4 = terrainData[0] / 32f;
} else {
int size = (int) Math.sqrt(terrainData.length);
try {
p1 = terrainData[(yInt + (xInt * size))] / 32f;
p2 = terrainData[((yInt + 1) + (xInt * size))] / 32f;
p3 = terrainData[((yInt) + ((xInt + 1) * size))] / 32f;
p4 = terrainData[((yInt + 1) + ((xInt + 1) * size))] / 32f;
} catch (Exception e) {
return null;
}
}
Vector3f result = new Vector3f();
if (p1 >= 0 && p2 >= 0 && p3 >= 0) {
Triangle tringle1 =
new Triangle(
new Vector3f(xInt * 2, yInt * 2, p1),
new Vector3f(xInt * 2, (yInt + 1) * 2, p2),
new Vector3f((xInt + 1) * 2, yInt * 2, p3));
if (ray.intersectWhere(tringle1, result)) {
return result;
}
}
if (p4 >= 0 && p2 >= 0 && p3 >= 0) {
Triangle tringle2 =
new Triangle(
new Vector3f((xInt + 1) * 2, (yInt + 1) * 2, p4),
new Vector3f(xInt * 2, (yInt + 1) * 2, p2),
new Vector3f((xInt + 1) * 2, yInt * 2, p3));
if (ray.intersectWhere(tringle2, result)) {
return result;
}
}
return null;
}
