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update projection

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This commit is contained in:
Hartmut Seichter 2022-12-19 19:20:39 +01:00
parent ffed77a2fc
commit f909a3e140
1 changed files with 15 additions and 6 deletions
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21
src/projection.rs
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@ -45,6 +45,8 @@ pub fn make_projection_rh_from_frustum_reversed(
) -> Mat4 {
assert!(z_near > 0.0 && z_far > 0.0);
info!("near {:?}",z_near);
//
// reversed z 0..1 projection based on https://thxforthefish.com/posts/reverse_z/
//
@ -57,15 +59,18 @@ pub fn make_projection_rh_from_frustum_reversed(
let sx = 2.0 * z_near / (right - left);
let sy = 2.0 * z_near / (top - bottom);
//
// for reverse z 0..1
// sx 0 a 0
// 0 sy b 0
// 0 0 c d
// 0 0 -1 0
Mat4::from_cols(
Vec4::new(sx, 0.0, 0.0, 0.0),
Vec4::new(0.0, sy, 0.0, 0.0),
Vec4::new(a, b, c, -1.0),
Vec4::new(0.0, 0.0, d, 0.0),
Vec4::new(0.0, 0.0, c, -1.0),
Vec4::new(a, b, d, 0.0),
)
}
pub fn make_projection_rh_custom(fov_y: f32, aspect_ratio: f32, z_near: f32, z_far: f32) -> Mat4 {
@ -117,13 +122,15 @@ pub fn create_offaxis_matrices(
// calculate a reasonable near distance
let z_near = min_near_distance.max(dist - min_near_distance_offset);
// let z_near = min_near_distance;
// distances
let left = vec_right_normalized.dot(frustum_left) * z_near / dist; // left screen edge
let right = vec_right_normalized.dot(frustum_right) * z_near / dist; // right screen edge
let bottom = vec_up_normalized.dot(frustum_left) * z_near / dist; // bottom screen edge
let top = vec_up_normalized.dot(frustum_up) * z_near / dist; // distance eye from screen
// info!("l r b t {} {} {} {}",left,right,bottom,top);
info!("l r b t {} {} {} {}",left,right,bottom,top);
// create a view frustum
let projection_matrix =
@ -151,7 +158,7 @@ pub fn create_offaxis_matrices(
Vec4::W,
);
let rotation_quat = Quat::from_mat4(&view_matrix_rotation); // Quat::from_mat4(view_matrix_rotation);
// let rotation_quat = Quat::from_mat4(&view_matrix_rotation); // Quat::from_mat4(view_matrix_rotation);
// info!("Rotation Mat {:?}",view_matrix_rotation);
// info!("Viewer Rotation {:?}",rotation_quat);
@ -161,6 +168,8 @@ pub fn create_offaxis_matrices(
// create resulting view matrix (this should be much simpler using glam API)
let view_matrix = view_matrix_rotation * view_matrix_eye;
// info!("{:?}",view_matrix_eye);
// return tuple of view and projection
(view_matrix, projection_matrix)
}