BTG file format: Difference between revisions

BTG file format (view source)

902 bytes added , 2 October 2008

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 All measurements are in meters.
+=== Texture Coordinates ===
+Texture coordinates are used to map textures onto 3D faces.
+For this each corner vertex of a face is associated with the location of the texture pixel to be shown at this corner.
+The texture is then projected onto the face using interpolation between the corner vertices.
+The x- and y-parts of the coordinates are specified in the range 0.0 to 1.0, where the location <code>(0,0)</code> relates to the origin of the texture and an x- respectively y-part of 1.0 corresponds to vertices at full width respectively height of the texture.
+Texture coordinates exceeding the range 0.0 to 1.0 are wrapped around, so that repeating textures are possible.
+For example if the x-parts of the texture coordinates of a face cover the range -2.0 to 3.0, the texture repeats five times horizontally.
+[[TerraGear]] makes heavy use of this feature for larger areas of the same material.
 === Endianness ===