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world position from depth buffer value
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// Reconstruct worldspace depth value from z/w depth buffer | |
float depth = -(z_near * z_far) / (zbuffer_depth * (z_far - z_near) - z_far); | |
// Compute screenspace coordinate of pixel | |
float2 screenspace = (float2(pixel.xy) / float2(viewport_size.xy)) * 2.0f - 1.0f; | |
// Get direction of ray from camera through pixel | |
float3 ray_direction = normalize(camera_forward + camera_right * screenspace.x - camera_up * screenspace.y); | |
// Reconstruct world position from depth: depth in z buffer is distance to picture plane, not camera | |
float distance_to_camera = depth / dot(ray_direction, camera_forward); | |
float3 world_position = camera_position + ray_direction * distance_to_camera; |
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