archive-gh-me/maplibre-rs
1
0
Fork 0
mirror of https://github.com/maplibre/maplibre-rs.git synced 2025-12-08 19:05:57 +00:00
Code Issues Projects Releases Wiki Activity

Extend example about converting coordinates

Browse Source
This commit is contained in:
Maximilian Ammann 2022-01-11 20:44:00 +01:00
parent 296ce39b7f
commit d4cdebf79d
1 changed files with 42 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
src/render/camera.rs
View File

@ -82,7 +82,7 @@ impl Perspective {
#[cfg(test)]
mod tests {
use cgmath::{ElementWise, Matrix4, Vector3, Vector4};
use cgmath::{ElementWise, Matrix4, SquareMatrix, Vector3, Vector4};
use super::{Camera, Perspective};
@ -94,34 +94,59 @@ mod tests {
let perspective = Perspective::new(width, height, cgmath::Deg(45.0), 0.1, 100000.0);
let projection = perspective;
let view_proj = (projection.calc_matrix() * camera.calc_matrix());
let world_pos: Vector4<f64> = Vector4::new(2000.0, 2000.0, 0.0, 1.0);
println!("world_pos: {:?}", world_pos);
let view_proj: Matrix4<f64> = (projection.calc_matrix() * camera.calc_matrix())
.cast()
.unwrap();
let world_pos = Vector4::new(2000.0, 2000.0, 0.0, 1.0);
let result = view_proj * world_pos;
let ndc = Vector3::new(
result.x / result.w,
result.y / result.w,
result.z / result.w,
);
println!("result: {:?}", result);
// Adopted from: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VkViewport.html
// and https://matthewwellings.com/blog/the-new-vulkan-coordinate-system/
let result_ndc = Vector4::new(
result.x / result.w,
result.y / result.w,
result.z / result.w,
result.w,
);
let min_depth = 0.0;
let max_depth = 1.0;
let x = 0.0;
let y = 0.0;
let ox = x + width as f32 / 2.0;
let oy = y + height as f32 / 2.0;
let ox = x + width as f64 / 2.0;
let oy = y + height as f64 / 2.0;
let oz = min_depth;
let px = width as f32;
let py = height as f32;
let px = width as f64;
let py = height as f64;
let pz = max_depth - min_depth;
let xd = ndc.x;
let yd = ndc.y;
let zd = ndc.z;
let xd = result_ndc.x;
let yd = result_ndc.y;
let zd = result_ndc.z;
let screen = Vector3::new(px / 2.0 * xd + ox, py / 2.0 * yd + oy, pz * zd + oz);
println!("{:?}", screen);
println!("screen: {:?}", screen);
// Adapted from: https://docs.microsoft.com/en-us/windows/win32/direct3d9/viewports-and-clipping#viewport-rectangle
let direct_x = Matrix4::from_cols(
Vector4::new(width as f64 / 2.0, 0.0, 0.0, 0.0),
Vector4::new(0.0, height as f64 / 2.0, 0.0, 0.0),
Vector4::new(0.0, 0.0, pz, 0.0),
Vector4::new(ox, oy, oz, 1.0),
);
let screen_hom = direct_x * result;
let screen = Vector3::new(
screen_hom.x / screen_hom.w,
screen_hom.y / screen_hom.w,
screen_hom.z / screen_hom.w,
);
println!("screen: {:?}", screen);
let result = direct_x.invert().unwrap() * screen_hom;
println!("result: {:?}", result);
let world_pos = view_proj.invert().unwrap() * result;
println!("world_pos: {:?}", world_pos);
}
}