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OBD talk:M3GM: Difference between revisions
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::;geyser | ::;geyser | ||
:M3GM contains only links, so it's done. (I don't look to the hierarchy.) | :M3GM contains only links, so it's done. (I don't look to the hierarchy.) | ||
:VCRA and IDXA ==> | :VCRA and IDXA ==> <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/werte.htm</nowiki> Any ideas? | ||
::;ssg | ::;ssg | ||
:IDXA and VCRA (and PNTA, even) are generic: they get interpreted in different ways depending on where they're linked to ''from''. | :IDXA and VCRA (and PNTA, even) are generic: they get interpreted in different ways depending on where they're linked to ''from''. | ||
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::(and in other cases, the high bit will mean something completely different) | ::(and in other cases, the high bit will mean something completely different) | ||
:Knowledge about IDXA etc should be detailed specifically to the resources that link to them: for example, the M3GM. | :Knowledge about IDXA etc should be detailed specifically to the resources that link to them: for example, the M3GM. | ||
::Look at your | ::Look at your site <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/werte.htm</nowiki> again. See how all the generic sub-resources of an M3GM are connected? They simply don't make the same sense when considered out of the M3GM's context... | ||
:That's why I say M3GM is not "done": because | :That's why I say M3GM is not "done": because <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/werte.htm</nowiki> is missing knowledge relative to ''M3GM'', ''not'' VCRA or IDXA... | ||
::Sometimes the hierarchy is crucial, i.e., you have to consider a file together with its children/parents. | ::Sometimes the hierarchy is crucial, i.e., you have to consider a file together with its children/parents. | ||
:M3GM: Again, they contain only links, so it's done. I know that there're different IDXA and VCRA files, so they are not done, because there is still no differentiation between the different files. | :M3GM: Again, they contain only links, so it's done. I know that there're different IDXA and VCRA files, so they are not done, because there is still no differentiation between the different files. | ||
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::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ||
---- | ---- | ||
:Most of the stuff is as ssg says | :Most of the stuff is as ssg says here: <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/werte.htm</nowiki>. | ||
:*PNTA, TXCA, first VCRA: vertex map (XYZ, UV, vertex normals). Vertex normals used for Gouraud shading. | :*PNTA, TXCA, first VCRA: vertex map (XYZ, UV, vertex normals). Vertex normals used for Gouraud shading. | ||
:*Second VCRA: face normals, for flat shading (not sure the engine ever switches from Gouraud to flat) and specular effects. | :*Second VCRA: face normals, for flat shading (not sure the engine ever switches from Gouraud to flat) and specular effects. | ||
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:door example: I don't agree with you, that they are "strips". | :door example: I don't agree with you, that they are "strips". | ||
:Biturn says, that they're triangles and you have to read the first IDXA in this way: | :Biturn says, that they're triangles and you have to read the first IDXA in this way: | ||
http://www6.fh-eberswalde.de/user/dkriesch/oni/doorcode.gif | <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/doorcode.gif</nowiki> | ||
:grey = high bit, red = same as the first column, yellow = same as the first row column but first and second value switched | :grey = high bit, red = same as the first column, yellow = same as the first row column but first and second value switched | ||
:If you read it step by step (I used Rhino3D), you get this: | :If you read it step by step (I used Rhino3D), you get this: | ||
http://www6.fh-eberswalde.de/user/dkriesch/oni/door.gif | <nowiki>http://www6.fh-eberswalde.de/user/dkriesch/oni/door.gif</nowiki> | ||
::;ssg | ::;ssg | ||
:That's ''exactly'' what strips look like. I couldn't have illustrated them better myself. Thanks. ^^ | :That's ''exactly'' what strips look like. I couldn't have illustrated them better myself. Thanks. ^^ | ||
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::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ||
::As for the first VCRA: they are vertex normals (basically, averages of the face normals for the adjacent faces). Normalized. | ::As for the first VCRA: they are vertex normals (basically, averages of the face normals for the adjacent faces). Normalized. | ||
:::Oni (OpenGL) uses them for [ | :::Oni (OpenGL) uses them for [[wikipedia:Gouraud_shading|Gouraud shading]]. | ||
::;geyser | ::;geyser | ||
:I'm not sure why so many entries are necessary for the PNTA and the first VCRA. To fix vertex lighting? | :I'm not sure why so many entries are necessary for the PNTA and the first VCRA. To fix vertex lighting? | ||
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:Regardless of technical issues, they have to duplicate PNTA entries because a vertex can have different UV and normals depending on what face it belongs to. And since all 3 arrays run alongside each other (indexed by the same ID in the first IDXA), PNTA has to be extended accordingly. | :Regardless of technical issues, they have to duplicate PNTA entries because a vertex can have different UV and normals depending on what face it belongs to. And since all 3 arrays run alongside each other (indexed by the same ID in the first IDXA), PNTA has to be extended accordingly. | ||
::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ::[[User:Geyser|geyser]] 19:30, 30 January 2007 (CET) | ||
{{OBD}} | |||