Importance

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Abstract

Methods and apparatus for rendering a spacial contour texture map onto a generally planar polygon for display on the screen of a video monitor in a computer graphic system includes a memory for storing spacial distance measures between the individual texels of the contour texture map and a boundary on the contour texture map as well as an indentifier flag to define whether the texel is on one side of the boundary or the other. The contour texture map is applied to a modeled polygon by computing the intersection of each direction vector extending from an eyepoint through the center of a selected pixel to the contour texture map in a map space coordinate system. The projected size of a pixel on the contour texture map is also computed. The distance between the intersection point of each direction vector and the boundary of the contour texture map is computed and is projected onto the pixel space, that is, the screen of the display monitor. If the projected distance between the intersection point and the boundary in pixel space is on one side of the boundary, a first texture value is assigned to the pixel for display. If the projected distance from the intersection point to the boundary is on the other side of the boundary then a second texture value is assigned to the pixel. If the distance between the intersection point and the boundary is within a feathering region then a proportion texture value is assigned to the pixel for display on the screen.

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First Claim