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backface culling attempt

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This commit is contained in:
Theis Pieter Hollebeek 2026-03-26 17:13:24 +01:00
parent d738478f54
commit 9ed493d19b
2 changed files with 10 additions and 3 deletions
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5
game/src/engine/math.rs
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@ -20,6 +20,11 @@ impl V3 {
let V3(bx, by, bz) = rhs;
Self(ay * bz - az * by, az * bx - ax * bz, ax * by - ay * bx)
}
pub fn dot(&self, rhs: Self) -> f64 {
let V3(ax, ay, az) = self;
let V3(bx, by, bz) = rhs;
ax * bx + ay * by + az * bz
}
}
impl Add for V3 {

8
game/src/engine/r3d.rs
View File

@ -36,8 +36,7 @@ impl<'r, R: Renderer> R3d<'r, R> {
}
pub fn draw_line(&mut self, from: V3, to: V3, color: Color) {
self.r
.draw_line((from).project_2d(), (to).project_2d(), color);
self.r.draw_line(from.project_2d(), to.project_2d(), color);
}
pub fn draw_triangle(&mut self, triangle: Triangle3, color: Color) {
@ -55,7 +54,10 @@ impl<'r, R: Renderer> R3d<'r, R> {
let normal_vector = face.normal_vector();
let pxyz = face.0 + normal_vector;
self.draw_line(face.0 + pos, pxyz + pos, Color::WED);
if normal_vector.2 < 0.0 {
let bingbongvector = face.0 - CAMERA_POS + pos;
self.draw_line(face.0 + pos, V3(0.0, 0.0, -0.99), Color::WED);
if normal_vector.dot(bingbongvector) < 0.0 {
self.draw_triangle(face.translate(pos - CAMERA_POS), outline_color);
}
}