Geometry (Metroid Prime): Difference between revisions
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An important thing to note off the bat is that both CMDL and MREA files are split up into a number of 32-byte-aligned ''sections''; their respective headers both declare a section count, and list the sizes of each section contained in the file. This is required to navigate to different parts of the file, and is required in order to read the geometry data correctly. Sections are generally split based on the type of data contained in them, so one section might contain vertex coordinates, while another contains a surface (submesh) definition. For the purposes of this article, each subheader will mark the start of a new section; use that as your cue to advance to the next one. Check the CMDL or MREA pages for more info on how the sections work. | An important thing to note off the bat is that both CMDL and MREA files are split up into a number of 32-byte-aligned ''sections''; their respective headers both declare a section count, and list the sizes of each section contained in the file. This is required to navigate to different parts of the file, and is required in order to read the geometry data correctly. Sections are generally split based on the type of data contained in them, so one section might contain vertex coordinates, while another contains a surface (submesh) definition. For the purposes of this article, each subheader will mark the start of a new section; use that as your cue to advance to the next one. Check the CMDL or MREA pages for more info on how the sections work. | ||
For vertex attributes, note that there's no count value present anywhere. If you want a rough count, you can divide the size of that attribute's section by the attribute's size. | In the CMDL format, and in the MP1/2 MREA format, all data sections appear in the order that they are listed in this page. In the Prime 3/DKCR MREA format, the surface definitions, surface group IDs, and surface lookup table are shifted to a different part of the file. | ||
For vertex attributes, note that there's no count value present anywhere. If you want a rough count, you can divide the size of that attribute's section by the attribute's size; this approach doesn't account for padding, however. | |||
=== Vertex Coordinates === | === Vertex Coordinates === | ||