Method and system for filtering of visual objects
A system, device, computer-readable instructions, and method are provided for mapping and filtering of visual objects to address bump mapping. For example, a system, device, computer-readable instructions, and method are provided as a unified shading model representing both bump orientation and bidirectional radiance distribution function (“BRDF”). The computer-readable instructions are non-transitory, and storable on a storage device, including a CDROM, flashdrive, cloud, processor memory, or other storage capability.
1. A method of rendering a computer generated 3D object, having an associated normal map containing bump normals, comprising:
identifying a common plane perpendicular to a surface normal of the 3D object, wherein the common plane is displaced from the surface of the 3D object;
projecting bump normals from the normal map into the common plane to create bump normal projections;
linearly combining the bump normal projections to create an average normal;
linearly combining second moments of the bump normal projections;
deriving a covariance matrix from the average normal and the combined second moments;
projecting a tangent space half-vector into the common plane;
performing a 3D graphics lighting operation using the average normal, combined second moments and the projected half-vector.
2. The method of claim 1 , wherein the 3D graphics lighting operation comprises a Beckman based lighting operation.
3. The method of claim 1 , wherein the normal map is stored in a MIP layer.
4. The method of claim 3 , further comprising a step of MIP filtering between multiple MIP layers.
5. The method of claim 1 , wherein the normal map is stored in a Linear Efficient Antialiased Normal map.
6. The method of claim 5 , further comprising blending two Linear Efficient Antialiased Normal map layers.
7. The method of claim 1 , further comprising a generating a Linear Efficient Antialiased Normal map in a pre-processing step.
8. A non-transitory computer readable medium having stored thereon computer program instructions for rendering a computer generated 3D object, having an associated normal map containing bump normals, comprising:
instructions identifying a common plane perpendicular to a surface normal of the 3D object, wherein the common plane is displaced from the surface of the 3D object;
instructions projecting bump normals from the normal map into the common plane to create bump normal projections;
instructions linearly combining the bump normal projections to create an average normal;
instructions linearly combining second moments of the bump normal projections;
instructions deriving a covariance matrix from the average normal and the combined second moments;
instructions projecting a tangent space half-vector into the common plane;
instructions performing a 3D graphics lighting operation using the average normal, combined second moments and the projected half-vector.
9. The computer readable medium of claim 8 , wherein the 3D graphics lighting operation comprises a Beckman based lighting operation.
10. The computer readable medium of claim 8 , wherein the normal map is stored in a MIP layer.
11. The computer readable medium of claim 10 , further comprising a step of MIP filtering between multiple MIP layers.
12. The computer readable medium of claim 8 , wherein the normal map is stored in a Linear Efficient Antialiased Normal map.
13. The computer readable medium of claim 12 , further comprising blending two Linear Efficient Antialiased Normal map layers.
14. The computer readable medium of claim 8 , further comprising a generating a Linear Efficient Antialiased Normal map in a pre-processing step.