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--- geometry_layout_commands [2015/12/02 15:45]
queueram Add See Also and References sections
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-======== Geometry Layout Commands ========
-The geometry layout commands define how geometric shapes are drawn.  Some geo layouts are contained after the Level data blocks and some are loaded with [[Level Commands#17: Load ROM to Segment|Level Command 0x17]] The first byte of the geo layout command is the command type.  Unlike the level commands, there is no length byte specified in the command.  Most geo layout commands are constant length, however, some depend on the values set.
-===== Drawing Layers =====
-^ Layer ^ Description ^
-| 00 | Unused |
-| 01 | Entirely Solid |
-| 02 | Unused |
-| 03 | Unused |
-| 04 | Transparent pixels, no semi transparency. Allows perfect layering with other transparencies around it. |
-| 05 | Semi transparency enabled. Layering must be handled with the order of drawn faces. |
-| 06 | Semi transparency enabled. Layering must be handled with the order of drawn faces. This layer is always drawn behind layer 05, usually for shadows. |
-===== Geometry Layout Commands =====
-==== 01: Terminate Geometry Layout ====
-The ending command to close.
-''01 00 00 00''
-Length: 4
-----
-==== 02: Branch Geometry Layout ====
-Branches the current geo layout to another area within a RAM bank.
-''02 01 00 00 [<color darkred>SS SS SS SS</color>]''
-| <color darkred>S</color> | Segmented address to branch to |
-Length: 8
-----
-==== 03: Return From Branch ====
-Ends the current geometry layout branch and returns to the area following the 0x02 command.
-''03 00 00 00''
-Length: 4
-----
-==== 04: Open Node ====
-If you don't understand nodes, this is basically like a sub-folder.
-''04 00 00 00''
-Length: 4
-----
-==== 05: Close Node ====
-Used at the end of the data within the opened node.
-''05 00 00 00''
-Length: 4
-----
-==== 0B: Start Geo Layout ====
-Starts geometry layout with no parameters whatsoever. Seems to use a pre-set render area.
-''0B 00 00 00''
-Length: 4
-----
-==== 0E: Switch Case ====
-Loads ASM in RAM that switches between the receding display lists within the node.
-''0E 00 00 [<color darkgray>NN</color>] [<color purple>AA AA AA AA</color>]''
-| <color darkgray>N</color> | Number of cases/display lists, starting at 01 |
-| <color purple>A</color> | ASM Function |
-Length: 8
-----
-==== 13: Load Display List ====
-Loads display list with drawing layer and offsets the model on X/Y/Z axis.
-''13 [<color darkgray>LL</color>] [<color darkred>XX XX</color>] [<color darkgreen>YY YY</color>] [<color darkblue>ZZ ZZ</color>] [<color purple>AA AA AA AA</color>]''
-| <color darkgray>L</color> | Drawing layer |
-| <color darkred>X</color> | Offset on X axis (s16) |
-| <color darkgreen>Y</color> | Offset on Y axis (s16) |
-| <color darkblue>Z</color> | Offset on Z axis (s16) |
-| <color purple>A</color> | Segmented address with display list |
-Length: C
-----
-==== 14: Billboard Model ====
-Billboards the model without needing the use of 0x21 in the behavior script.
-''14 00 00 00 00 00 00 00''
-Length: 8
-----
-==== 15: Load Display List ====
-Loads display list with drawing layer and no other properties.
-''15 [<color darkgray>LL</color>] 00 00 [<color purple>AA AA AA AA</color>]''
-| <color darkgray>L</color> | Drawing layer |
-| <color purple>A</color> | Segmented address with display list |
-Length: 8
-----
-==== 16: Start Geo Layout with Shadow ====
-Used at start of the geo layout, with shadow type, solidity, and size.
-''16 00 00 [<color darkred>AA</color>] 00 [<color darkgreen>BB</color>] [<color darkblue>CC CC</color>]''
-| <color darkred>A</color> | Shadow type |
-| <color darkgreen>B</color> | Shadow solidity (00=invisible, FF=black) |
-| <color darkblue>C</color> | Shadow scale |
-Length: 8
-----
-==== 18: Load Polygons ASM ====
-Used in some original objects to point to ASM in RAM, for misc. effects such as vertex rippling.
-''18 00 00 00 [<color darkblue>AA AA AA AA</color>]''
-| <color darkred>A</color> | ASM RAM Address |
-Length: 8
-----
-==== 1D: Scale Model ====
-Scales the receding data uniformly.
-''1D [<color darkred>A</color>][<color darkgreen>B</color>] 00 00 [<color darkblue>SS SS SS SS</color>] {?? ?? ?? ??}''
-| <color darkred>A</color> | If MSbit is set, load B and ?? |
-| <color darkgreen>B</color> | If MSbit of <color darkred>A</color> is set, use for A2 to 8037B940 |
-| <color darkblue>S</color> | Scale percentage (0x10000 = 100%) |
-| ?? | optional word used if the MSbit of <color darkred>A</color> is set |
-Length: 8-C (variable)
-----
-==== 20: Start Geo Layout with Render Area ====
-Starts the geometry layout with no shadow and a render area.
-''20 00 [<color darkred>AA AA</color>]''
-| <color darkred>A</color> | Render distance? |
-Length: 4
-===== See Also =====
-[[Level Commands]]
-===== References =====
-  * http://origami64.net/showthread.php?tid=9
-  * http://www.smwcentral.net/?p=viewthread&t=74776
-  * http://qubedstudios.rustedlogic.net/Mario64_HackingDoc1.5.txt

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