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Cam scale cluster fix (#7078)

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# Objective

fix clustering calculations for cameras with non-unit scale

## Solution

get view scale and apply to light range at various points
This commit is contained in:
robtfm 2023-02-07 16:10:54 +00:00
parent 5a152d7d75
commit 5581cfe0d1
1 changed files with 15 additions and 5 deletions
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20
crates/bevy_pbr/src/light.rs
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@ -912,12 +912,13 @@ const VEC2_HALF_NEGATIVE_Y: Vec2 = Vec2::new(0.5, -0.5);
/// `Z` in view space, with range `[-inf, -f32::MIN_POSITIVE]`
fn cluster_space_light_aabb(
inverse_view_transform: Mat4,
view_inv_scale: Vec3,
projection_matrix: Mat4,
light_sphere: &Sphere,
) -> (Vec3, Vec3) {
let light_aabb_view = Aabb {
center: Vec3A::from(inverse_view_transform * light_sphere.center.extend(1.0)),
half_extents: Vec3A::splat(light_sphere.radius),
half_extents: Vec3A::from(light_sphere.radius * view_inv_scale.abs()),
};
let (mut light_aabb_view_min, mut light_aabb_view_max) =
(light_aabb_view.min(), light_aabb_view.max());
@ -1287,6 +1288,8 @@ pub(crate) fn assign_lights_to_clusters(
let mut requested_cluster_dimensions = config.dimensions_for_screen_size(screen_size);
let view_transform = camera_transform.compute_matrix();
let view_inv_scale = camera_transform.compute_transform().scale.recip();
let view_inv_scale_max = view_inv_scale.abs().max_element();
let inverse_view_transform = view_transform.inverse();
let is_orthographic = camera.projection_matrix().w_axis.w == 1.0;
@ -1297,7 +1300,7 @@ pub(crate) fn assign_lights_to_clusters(
.iter()
.map(|light| {
-inverse_view_row_2.dot(light.transform.translation().extend(1.0))
+ light.range
+ light.range * view_inv_scale.z
})
.reduce(f32::max)
.unwrap_or(0.0)
@ -1319,6 +1322,8 @@ pub(crate) fn assign_lights_to_clusters(
(false, 1) => config.first_slice_depth().max(far_z),
_ => config.first_slice_depth(),
};
let first_slice_depth = first_slice_depth * view_inv_scale.z;
// NOTE: Ensure the far_z is at least as far as the first_depth_slice to avoid clustering problems.
let far_z = far_z.max(first_slice_depth);
let cluster_factors = calculate_cluster_factors(
@ -1343,6 +1348,7 @@ pub(crate) fn assign_lights_to_clusters(
// it can overestimate more significantly when light ranges are only partially in view
let (light_aabb_min, light_aabb_max) = cluster_space_light_aabb(
inverse_view_transform,
view_inv_scale,
camera.projection_matrix(),
&light_sphere,
);
@ -1500,6 +1506,7 @@ pub(crate) fn assign_lights_to_clusters(
let (light_aabb_xy_ndc_z_view_min, light_aabb_xy_ndc_z_view_max) =
cluster_space_light_aabb(
inverse_view_transform,
view_inv_scale,
camera.projection_matrix(),
&light_sphere,
);
@ -1530,12 +1537,14 @@ pub(crate) fn assign_lights_to_clusters(
// center point on the axis of interest plus the radius, and that is not true!
let view_light_sphere = Sphere {
center: Vec3A::from(inverse_view_transform * light_sphere.center.extend(1.0)),
radius: light_sphere.radius,
radius: light_sphere.radius * view_inv_scale_max,
};
let spot_light_dir_sin_cos = light.spot_light_angle.map(|angle| {
let (angle_sin, angle_cos) = angle.sin_cos();
(
(inverse_view_transform * light.transform.back().extend(0.0)).truncate(),
(inverse_view_transform * light.transform.back().extend(0.0))
.truncate()
.normalize(),
angle_sin,
angle_cos,
)
@ -1676,7 +1685,8 @@ pub(crate) fn assign_lights_to_clusters(
let angle_cull =
distance_closest_point > cluster_aabb_sphere.radius;
let front_cull = v1_len > cluster_aabb_sphere.radius + light.range;
let front_cull = v1_len
> cluster_aabb_sphere.radius + light.range * view_inv_scale_max;
let back_cull = v1_len < -cluster_aabb_sphere.radius;
if !angle_cull && !front_cull && !back_cull {