Hewlett-Packard Development Company, L.p.

Hewlett-Packard Company

Bradford A Ritter

Noah Horton

Ross Cunniff

Daniel George Gelb

Thomas Malzbender

A texture mapping system comprises memory and a texture map manager. The memory stores a parametric texture map, and the parametric texture map has a plurality of texels. Each of the texels defines a variable expression that defines a luminosity parameter as a function of light direction. The texture map manager is configured to perform a rotation of a texture defined by the parametric texture map, and the texture map manager is further configured to adjust the variable expression of at least one of the texels to compensate for the rotation.

System and method that compensate for rotations of textures defined by parametric texture maps

A system for resampling texture maps in accordance with an exemplary embodiment of the present invention comprises memory and a texture map manager. The stores a first texture map defining a first texture, and the first texture map is based on an image of an object. The texture map manager is configured to resample the first texture map such that resampling of the first texture map, by the texture map manager, compensates for a surface distortion of the object.

System and method for resampling texture maps

In one embodiment, a method for synthesizing a texture of a desired size from a sample texture is provided. The method comprises the steps of generating a matrix of the desired size, and providing values to the matrix. The values include random values and at least a portion of the values represents a desired structure according to which graphical features of a synthesized texture are to substantially conform. The method further comprises executing a texture synthesis process that utilizes the matrix to generate a synthesized texture of the desired size having graphical features arranged therein substantially in conformance with the desired structure.

System and method for performing texture synthesis

According to one embodiment of the present invention, a method for rendering a digital image having surface reflectance properties is disclosed. The method comprises creating a parametric texture map that comprises parameters for an equation that defines a surface structure in a manner in which the appearance of the surface structure includes surface reflectance properties. The method further comprises rendering a digital image using the parametric texture map.

System and method for rendering digital images having surface reflectance properties

A texture mapping system comprises memory and a texture map manager. The memory stores a first texture map and a parametric texture map. The texture map manager is configured to combine at least a portion of the first texture map and at least a portion of the parametric texture map, and the texture map manager is configured to determine a texture map type for the first texture map and a texture map type for the parametric texture map and to perform a prioritization of the texture map portions based on the determined texture map types. The texture map manager is further configured to select, for conversion, one of the texture map portions based on the prioritization and to convert the selected texture map portion into a form corresponding to a form of the non-selected texture map portion.

System and method for combining parametric texture maps

A graphical display system comprises memory and a texture mapper. The memory stores a parametric texture map (PTM) and a non-parametric texture map (non-PTM). The texture mapper is configured to selectively apply, based on a viewing parameter of a graphical object, the PTM and the non-PTM to a pixel of the graphical object.

Graphical display system and method for applying parametric and non-parametric texture maps to graphical objects

In one embodiment, the present invention is directed to method for assigning coefficients to a texel of a parametric texture map (PTM) texture. The method may comprise the steps of: generating a random PTM matrix of a desired size, the random PTM matrix comprising texels possessing random valued coefficients; selecting a texel from the random PTM matrix; determining a first neighborhood of the texel from the random PTM matrix; comparing the first neighborhood to neighborhoods of a sample PTM texture to determine an optimal texel of the sample PTM texture; and assigning PTM coefficients of the optimal texel to the texel from the random PTM matrix.

System and method for synthesis of parametric texture map textures

One embodiment of the present invention provides a method for rendering a three-dimensional 3D graphical image. The method comprises representing the 3D graphical image as a plurality of graphics primitives, each having a plurality of vertices. For each of said plurality of graphics primitives, at least two texture coordinate gradient vectors are computed. Additionally, for each vertex of the plurality of graphics primitives, the method comprises determining a 3D coordinate frame, wherein such determining step includes using the at least two texture coordinate gradient vectors computed for the respective graphics primitive for orienting the 3D coordinate frame. Thereafter, the method comprises utilizing at least the 3D coordinate frame to determine parameters of a parametric texture mapping function.

Method for efficiently calculating texture coordinate gradient vectors

In one embodiment, the present invention is directed to a system for rendering a pixel of a digital image. The system may comprise a texture map data structure representing a texture map of a plurality of texels; the texture map structure comprising a plurality of coefficients for each texel of the texture map; the plurality of coefficients defining lighting characteristics of the respective texel in response to illumination in a plane. The system may further comprise a modulation data structure; the modulation data structure defining a range of values associated with an illumination vector. Additionally, the system may comprise a rendering algorithm; the rendering algorithm operable to calculate a texel display value using the texture map data structure; the rendering algorithm operable to determine an illumination modulation value from the modulation data structure; and the rendering algorithm being operable to multiply the texel display value by the illumination modulation value to render a pixel.

System and method for rendering a texture map utilizing an illumination modulation value

The present invention provides a method and apparatus for performing H-space bump mapping. The apparatus of the present invention is a fragment processor of a computer graphics display system. The method of the present invention is performed by the fragment processor. In accordance with the method of the present invention, for each vertex of each polygon being processed, the fragment processor calculates both diffuse and specular lighting terms. Then, for each fragment within the polygon defined by the vertices, the fragment processor interpolates the specular and diffuse lighting terms to obtain diffuse and specular lighting terms for each fragment. If bump mapping has been enabled, the fragment processor adds perturbations to the diffuse and specular lighting terms to generate the bump mapping. Preferably, prior to performing the H-space bump mapping algorithm, texture coordinate gradient vectors are calculated for the image to be rendered. During the H-space bump mapping algorithm of the present invention, the H-space reference vectors are aligned with the texture coordinate gradient vectors. The specular and diffuse lighting terms are calculated using the H-space reference vectors. Since the H-space reference vectors are aligned with the texture coordinate vectors, it is not necessary to transform the specular and diffuse lighting terms into the coordinate system associated with the texture coordinates of the bump map on a per fragment (i.e., per pixel basis). Once the H-space reference vectors have been aligned with the texture coordinate gradient vectors, the algorithm proceeds in the aforementioned manner.

Method and apparatus for performing H-space bump mapping suitable for implementation with H-space lighting in a graphics pipeline of a computer graphics display system

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Fort Collins, CO, United States of America

Bradford A Ritter