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DarkBASIC Professional Discussion / Vertex moving of 3d primitive objects

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NoteJam
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Posted: 25th Apr 2005 14:20
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Is there anyway we can move vertexs of 3d primitives around in dark basic? I would like to do such a thing under program control in a game.

This would just be one more light show type entertainment graphic.

Seems like it would be a good thing to do at random and figure out how to do it symetrical, as such a program could be factory for creating 3d objects to use for other things.
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Tomu
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Posted: 25th Apr 2005 14:23
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look at memblocks

make memblock from mesh

then press f1 to get the help

tomu


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Mike P
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Posted: 25th Apr 2005 16:13
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In 5.8 Didn't TGC add some vertex commands? Not sure what they are though...

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Alkoran
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Posted: 26th Apr 2005 03:16
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Dunno how it'll be in your version, my version's quite old, I'd use this bit of code to create a FVF338 memblock of the object.

FVF stands for flexible vertex format and is a way in which the vaious information associated with the vertecies can be stored. 338 is a a good one to use as it deals with the information that you're most likely to want to play with and is the one covered in the help files
IIRC the help files layout quite well how an fvf 338 memblock is organised but just incase this is how to read (and write) one.

offset:type:meaning:value
header
0 : DWORD : FVFformat : 338
4 : DWORD : FVFsize the size in bites of each vertex : 36(for fvf338)
8 : DWORD : number of vertices in mesh : 36 for a cube
next comes the vertex elements, each one is constructed as follows, each group of three vertices makes up a poly
NB. this info only applies to FVF 338
+0 : FLOAT : X position
+4 : FLOAT : Y position
+8 : FLOAT : Z position
+12 : FLOAT : X component of normal vector
+16 : FLOAT : Y component of normal vector
+20 : FLOAT : Z component of normal vector
+24 : DWORD : colour of vertex (diffuse) - I'm not too hot on lighting dunno how this works
+28 : FLOAT : U texturing coord
+32 : FLOAT : V texturing coord
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NoteJam
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Posted: 26th Apr 2005 06:14
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look at memblocks

make memblock from mesh

then press f1 to get the help

Would you please elaborate on how does one look at a memblock make memblock from mesh?
Think I can manage the f1 key, lol.
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IanM
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Posted: 26th Apr 2005 06:20
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Quote: "+24 : DWORD : colour of vertex (diffuse) - I'm not too hot on lighting dunno how this works"


You just fill it with the colour from an RGB command. You can also include alpha information in the hi byte if you want to.

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kkzgreen
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Posted: 26th Apr 2005 08:25 Edited at: 26th Apr 2005 09:10
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hey guys

I'm just starting on memblocks.

What is the default FVF format in DBP primitives?

EDIT: Never mind, I figured it out.
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Avan Madisen
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Posted: 26th Apr 2005 08:46
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Update 5.8 DOES have vertex manipulation using what's called a vertex buffer, haven't played with it yet but it should allow very fast real-time vertex manipulation! There's info in the help file for the commands, but no instructions on how to use them, most are fairly self-explanatory.

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kkzgreen
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Posted: 26th Apr 2005 10:28
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Do any of you know what would be in a memblock made from a mesh that contains limbs?

Would it simply contain the usual data w/o even mentioning the limbs? or would there be a new header?
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Avan Madisen
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Posted: 27th Apr 2005 07:25 Edited at: 27th Apr 2005 07:25
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Converting a limbed object into a memblock loses all limb data, this is because you have to convert the object into a mesh first. Memblocks cannot be used to create limbed objects, only seperate meshes.

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kkzgreen
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Posted: 27th Apr 2005 08:06
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Thanks
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HenriqueLuna
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Posted: 29th Apr 2005 09:54
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FVF_XYZRHW = 0x004 : R. W. H. = abbreviation of ?

FVF_XYZB1 = 0x006 : which difference among B1 and B5 ?
FVF_XYZB2 = 0x008
FVF_XYZB3 = 0x00a
FVF_XYZB4 = 0x00c
FVF_XYZB5 = 0x00e

FVF_PSIZE = 0x020 : size of what ?

I am with bugs in the head = ( * ) * Bugs =
does anybody know how to explain this?

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IanM
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Posted: 29th Apr 2005 21:42
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FVF_PSIZE = point size. It only means something when working with point-sprites, which you cannot do with DBPro.

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HenriqueLuna
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Posted: 29th Apr 2005 23:53
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OBG P/ AJUDA IanM = Thx
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spooky
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Posted: 30th Apr 2005 00:05
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U5.8's vertex manipulation commands are pretty easy to understand.

I 'think' you may have to recalculate normals if you orient faces in different direction, but this example does not do that.



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Cryptoman
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Posted: 30th Apr 2005 00:16 Edited at: 30th Apr 2005 00:25
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I don't know why, but that program crashes with my 5.8.


Edit: Hmmm, it seems everything doesn't work. I'm going to reinstall.


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Cryptoman
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Posted: 30th Apr 2005 00:38
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Tis the oddist thing. None of the new commands work in 5.8 anymore with two reinstalls.


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NoteJam
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Posted: 6th May 2005 03:43
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Quote: "look at memblocks
make memblock from mesh
then press f1 to get the help
tomu"


I finally figured out what tomu was saying. If you type in your dark basic editor any command, such as memblock,or do this in a listing, and then push the f1 key while cursor is on the command you jump to help on that command.
If more than one command is on the line, hold down left mouse button and drag to highlight just one command, then press the f1 key.
Cool trick Tomu!
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Raven
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Posted: 6th May 2005 04:52
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Quote: "FVF_XYZRHW = 0x004 : R. W. H. = abbreviation of ?

FVF_XYZB1 = 0x006 : which difference among B1 and B5 ?
FVF_XYZB2 = 0x008
FVF_XYZB3 = 0x00a
FVF_XYZB4 = 0x00c
FVF_XYZB5 = 0x00e

FVF_PSIZE = 0x020 : size of what ?"


RHW .. can't remember what the RH stand for, it's something weird to do with the name of who created it in Math; but it just means a 4 Positional Vector which is Position + Normal Length.

B1 = XYZB
B2 = XYZBB
B3 = XYZBBB (see the pattern?)

They're used purely for vertex shaders, for carrying additional data. Doubt they work in DBP though.

PSize = Point Size. Typically your Points (Vertex Points) aren't rendered. If you add them though you can change thier size. No idea what you'd use it for, and again I doubt DBP is capable of using them... but fun to know eh?

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