BTG file format: Difference between revisions

BTG file format (view source)

964 bytes added , 30 September 2008

26

edits

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 === Color List ===
-TODO
+The Color List object contains a list of color definitions to be referenced by other geometry primitives.
+The properties of a Color List object are ignored.
+Each element of a Color List object is a list of color definitions.
+Each of the colors gets a unique index, starting with 0 for the first color found in the file and incrementing by 1 for each further color.
+{| border="1"
+|-
+! Byte offset
+! Type
+! Description
+|-
+| align="right"| 0
+| unsigned int
+| number of bytes in this element
+|-
+| align="right"| 4
+| color definitions
+| color definition list
+|}
+Each color definition is a 4-tuple of single precision floating point values:
+{| border="1"
+|-
+! Byte offset
+! Type
+! Description
+|-
+| align="right"| 0
+| float
+| red part
+|-
+| align="right"| 4
+| float
+| green part
+|-
+| align="right"| 8
+| float
+| blue part
+|-
+| align="right"| 12
+| float
+| alpha part
+|}
+The number of coordinates in an element is therefore the number of bytes in the element divided by 16.
 === Points ===