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easier chunk normal using double cross product

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laundmo 2023-06-14 17:55:42 +02:00 committed by juliancoffee
parent 59bf62a453
commit 91c718b931
1 changed files with 7 additions and 19 deletions
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26
world/src/sim/mod.rs
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@ -1644,28 +1644,16 @@ impl WorldSim {
if (curr_chunk.alt - downhill_chunk.alt) == 0. {
return Some(Vec3::unit_z());
}
let calc_zero = chunk_pos
let curr = chunk_pos.cpos_to_wpos_center().as_().with_z(curr_chunk.alt);
let down = downhill_chunk_pos
.cpos_to_wpos_center()
.as_()
.with_z(downhill_chunk.alt);
let downhill = calc_zero
- Vec3::<f32>::from((
downhill_chunk_pos.cpos_to_wpos_center().as_(),
downhill_chunk.alt,
));
let curr = Vec3::zero().with_z(curr_chunk.alt);
let flat_dist = downhill.magnitude();
let f = curr.z.powi(2) / flat_dist;
let neg_normal = Vec3::new(
(-downhill.x / flat_dist) * f,
(-downhill.y / flat_dist) * f,
0.,
);
let normal = neg_normal - curr;
Some(normal.normalized())
let downwards = curr - down;
let flat = downwards.with_z(down.z);
let mut res = downwards.cross(flat).cross(downwards);
res.normalize();
Some(res)
}
/// Draw a map of the world based on chunk information. Returns a buffer of