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Move occlusion culling back to being based on euclidian distance but with some distance calculation using double precision

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This commit is contained in:
Rudolph Bester 2025-07-01 19:01:38 +02:00
parent e1b4101e34
commit a54df7fdb7
2 changed files with 9 additions and 4 deletions
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3
modules/raycast/raycast_occlusion_cull.cpp
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@ -174,8 +174,7 @@ void RaycastOcclusionCull::RaycastHZBuffer::sort_rays(const Vector3 &p_camera_di
int k = tile_i * TILE_SIZE + tile_j;
int tile_index = i * tile_grid_size.x + j;
Vector3 ray_dir(camera_rays[tile_index].ray.dir_x[k], camera_rays[tile_index].ray.dir_y[k], camera_rays[tile_index].ray.dir_z[k]);
mips[0][y * buffer_size.x + x] = camera_rays[tile_index].ray.tfar[k] * p_camera_dir.dot(ray_dir); // Store z-depth in view space.
mips[0][y * buffer_size.x + x] = camera_rays[tile_index].ray.tfar[k];
}
}
}

10
servers/rendering/renderer_scene_occlusion_cull.h
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@ -71,7 +71,9 @@ public:
return false;
}
float min_depth = -closest_point_view.z;
// Force distance calculation to use double precision to avoid floating-point overflow for distant objects.
closest_point = closest_point - p_cam_position;
float min_depth = Math::sqrt((double)closest_point.x * (double)closest_point.x + (double)closest_point.y * (double)closest_point.y + (double)closest_point.z * (double)closest_point.z);
Vector2 rect_min = Vector2(FLT_MAX, FLT_MAX);
Vector2 rect_max = Vector2(FLT_MIN, FLT_MIN);
@ -82,9 +84,13 @@ public:
Vector3 corner = Vector3(p_bounds[0] * c.x + p_bounds[3] * nc.x, p_bounds[1] * c.y + p_bounds[4] * nc.y, p_bounds[2] * c.z + p_bounds[5] * nc.z);
Vector3 view = p_cam_inv_transform.xform(corner);
// When using an orthogonal camera, the closest point of an AABB to the camera is guaranteed to be a corner.
if (p_cam_projection.is_orthogonal()) {
min_depth = MIN(min_depth, -view.z);
}
Plane vp = Plane(view, 1.0);
Plane projected = p_cam_projection.xform4(vp);
min_depth = MIN(min_depth, -view.z);
float w = projected.d;
if (w < 1.0) {