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[unpaid]Micro-tutorial of D3D mesh-generation
#330404
06/27/10 12:54
06/27/10 12:54
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Joined: Feb 2008
Posts: 3,232
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I give up... I just cant get it together... I hate directX!
Help!!
Can someone please write me a lite-c script to generate
a 4-vertex, 4-triangle, uv-mapped mesh using directx functions?
I just cant get it to go.
Please make the code as verbose as possible, no shortcuts please.
I just intend to teach myself from this, rather than use it in any project.
It is to run in lite-c with only lite-c.h and d3d9.h includes.
It also needs to use the standard D3DVERTEX as found in atypes.h.
Process that needs to be followed(unless flow is impossible):
1>open some entity from mdl-file
2>backup its existing mesh (eng_getmesh?)
3>create a new mesh with D3DXCreateMeshFVF
4>create new vertex buffer using CreateVertexBuffer (if not created by step#3
5>fill VB with a 4-pixel 100x100 'square'
6>create new face/triangle buffer using CreateIndexBuffer(?)(if not created by step#3
7>fill with 4 faces to make 'square' double sided
8>setup uvmapping so back side is mirror-image of front.
9>any other steps required before ent_setskin
10>ent_setmesh to the original entity.
Need more info? I hope not... But ask if you do.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: EvilSOB]
#330528
06/28/10 06:46
06/28/10 06:46
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Posts: 3,232
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No takers? C'mon you big bunch of 'girlie-men'. Give it a try. If it just needs more clarifying, this is what Im trying to achieve. But it dont display anything, but I dont even know if it is generating a valid mesh or not. That why I wanted the above...
LPD3DXMESH *faked_mesh, *backup_mesh;
void make_panelmesh_startup()
{ ///////////////////////////////////////////////////////////////////////////////////////
static short Ibuff[2] ={ 0, 2 };
static short Vbuff[112] ={ 0,16968,0,49736,0,0,0,32768,0,32768,0,49024,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,49736,0,16968,0,0,0,32768,0,
32768,0,49024,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,49736,
0,49736,0,0,0,32768,0,32768,0,16256,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,16968,0,16968,0,0,0,32768,0,32768,0,
16256,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
///////////////////////////////////////////////////////////////////////////////////////
LPDIRECT3DDEVICE9 pd3d_dev = pd3ddev;
LPD3DXMESH pMesh = NULL;
D3DVERTEX* pVertBuff = NULL;
byte* pFaceBuff = NULL;
DWORD pVerts = 4;
DWORD pFaces = 4;
///////////////////////////////////////////////////////////////////////////////////////
if(SUCCEEDED(D3DXCreateMeshFVF(pFaces,pVerts,D3DXMESH_MANAGED,D3DFVF_D3DVERTEX,pd3d_dev, &pMesh)))
{ if(SUCCEEDED(pMesh->LockVertexBuffer(D3DLOCK_NO_DIRTY_UPDATE, &pVertBuff)))
{ memcpy(pVertBuff, Vbuff, sizeof(D3DVERTEX)*pVerts);
pMesh->UnlockVertexBuffer(); }
if(SUCCEEDED(pMesh->LockIndexBuffer(D3DLOCK_NO_DIRTY_UPDATE, &pFaceBuff)))
{ memcpy(pFaceBuff, Ibuff, pFaces);
pMesh->UnlockIndexBuffer(); }
}
faked_mesh = pMesh;
}
void splice(ENTITY* ent)
{
if(ent.skill1==0)
{ backup_mesh = ent_getmesh(ent,0,0); ent_setmesh(ent,(void*)faked_mesh,0,0); ent.skill1=1; }
else
{ ent_setmesh(ent,backup_mesh,0,0); backup_mesh = NULL; ent.skill1=0; }
}
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: EvilSOB]
#330546
06/28/10 11:20
06/28/10 11:20
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Joined: Jul 2007
Posts: 959
nl
flits
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User
Joined: Jul 2007
Posts: 959
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i will try somthing on monday but i cant promising anything you got lots of more experience in stuff like this
i realy though you needed to do somthing to update the new shaders ore somthing before it shows correctly?
not sure, i think it wont work ent_fixnormals(my,my.frame);
if you got the solution we can maby do some creasy stuff with it
anyway i think i cant do it but trying it is worth it
"empty"
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: flits]
#330574
06/28/10 15:01
06/28/10 15:01
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Joined: Feb 2008
Posts: 3,232
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I'll get there, I just some short-term the support of a DirectX guru.
I really need this for my 3D-Panels system. (look in Lite-C Contributions)
FYI, ent_fixnormals no help Im afraid....
I fear Im missing something simple and fundamental.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: EvilSOB]
#330903
06/30/10 18:25
06/30/10 18:25
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Joined: Jul 2007
Posts: 959
nl
flits
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User
Joined: Jul 2007
Posts: 959
nl
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i tried alot en i did create a cube creating a skin doesnt work yet but oke the only mistake i think that you made is the indexbuffer its pretty hard to assing the right vertex to the poly's
#include <litec.h>
#include <default.c>
#include <d3d9.h>
var ent_test = NULL;
long num_tris = 13;
long num_verts = 8;
D3DVERTEX* pVertBuff = NULL;
byte* pFaceBuff = NULL;
LPD3DXMESH pNewMesh;
short IndexData[36] = { 3,2,1,3,1,0,
4,5,6,4,6,7,
2,6,5,1,2,5,
3,4,7,3,0,4,
0,1,4,5,4,1,
2,3,6,7,6,3};
var i;
void test()
{
ent_test = my;
D3DXCreateMeshFVF(num_tris,num_verts,D3DXMESH_MANAGED,D3DFVF_D3DVERTEX,(LPDIRECT3DDEVICE9)pd3ddev,&pNewMesh);
var fhandle = file_open_read ("test.txt");
pNewMesh->LockVertexBuffer( 0, &pVertBuff);
for(i=0;i<8;i++)
{
pVertBuff[i].x = file_var_read(fhandle);
pVertBuff[i].y = file_var_read(fhandle);
pVertBuff[i].z = file_var_read(fhandle);
pVertBuff[i].nx = file_var_read(fhandle);
pVertBuff[i].ny = file_var_read(fhandle);
pVertBuff[i].nz = file_var_read(fhandle);
pVertBuff[i].u1 = file_var_read(fhandle);
pVertBuff[i].v1 = file_var_read(fhandle);
pVertBuff[i].u2 = file_var_read(fhandle);
pVertBuff[i].v2 = file_var_read(fhandle);
pVertBuff[i].x3 = file_var_read(fhandle);
pVertBuff[i].y3 = file_var_read(fhandle);
pVertBuff[i].z3 = file_var_read(fhandle);
pVertBuff[i].w3 = file_var_read(fhandle);
}
pNewMesh->UnlockVertexBuffer();
file_close(fhandle);
pNewMesh->LockIndexBuffer(0, &pFaceBuff);
memcpy(pFaceBuff,IndexData, 36*sizeof(short));
pNewMesh->UnlockIndexBuffer();
wait(1);
ent_setmesh(my,pNewMesh,0,0);
c_setminmax(my);
c_updatehull(my,1);
}
void quit()
{
return;
pMesh = ent_getmesh(ent_test,0,0);
pMesh->Release();
ent_setmesh(ent_test,NULL,0,0);
}
void main()
{
fps_max = 80;
wait(1);
level_load("");
ent_create("blok.mdl",vector(255,0,0),test);
on_exit = quit;
}
test.txt
-8 8 -8 -0.408 0.408 -0.816 0 0 0 0 0 0 0 0 8 8 -8 0.667 0.667 -0.333 0.801 0 0.801 0 0 0 0 0 8 8 8 0.408 0.408 0.816 0 0 0 0 0 0 0 0 -8 8 8 -0.667 0.667 0.333 0.801 0 0.801 0 0 0 0 0 -8 -8 -8 -0.667 -0.667 -0.333 0 0.795 0 0.795 0 0 0 0 8 -8 -8 0.408 -0.408 -0.816 0.801 0.795 0.801 0.795 0 0 0 0 8 -8 8 0.667 -0.667 0.333 0 0.795 0 0.795 0 0 0 0 -8 -8 8 -0.408 -0.408 0.816 0.801 0.795 0.801 0.795 0 0 0 0
Last edited by flits; 06/30/10 18:26.
"empty"
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: MrGuest]
#331179
07/02/10 12:29
07/02/10 12:29
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
OP
Expert
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OP
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Joined: Feb 2008
Posts: 3,232
Australia
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Im back at last.... Thanks for the reply guys.
flits: Im taking a look at your code now.
MrGuest: Yeah, but they just confused me more than anything because
the code 'jumps around" so much between step, without being really clear about what each step is doing...
I will post results...
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: EvilSOB]
#331201
07/02/10 15:04
07/02/10 15:04
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
OP
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OP
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Joined: Feb 2008
Posts: 3,232
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Thanks muchly flits.
It helps and it doesnt help.
I can now see that it is ONLY a flaw in my data, not my coding.
But the data I was using was extracted from a real MDL file, so now
Ive got to figure out why...
Thanks dude.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: EvilSOB]
#331208
07/02/10 16:26
07/02/10 16:26
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Joined: Jul 2007
Posts: 959
nl
flits
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i did extract it from a mdl also (execept index buffer)
didnt know where to start so i didt start with the vertex buffer
the hardes part was to get the index buffer working
index buffer connectes the polygons between the vertex
i read somewhere that you need to nubmer the clock wise ( i didnt understand this myself)
as far as i learnt from al of this is that the easest part is the positions of the vertex
you can find the rest in D3DVERTEX
typedef struct {
float x,y,z; // position in DirectX coordinates
float nx,ny,nz; // normal
float u1,v1; // first coordinate set, for textures
float u2,v2; // second coordinate set, for shadow maps
float x3,y3,z3,w3; // third coordinate set, for tangent vector and handedness
// float tu4,tv4; // 4th coordinate set (not yet implemented), for additional data
} D3DVERTEX;
already there in atypes.h
there is even more i learnt, after setting this up
vertex related stuff dont work (probaly fixable with vec_to_mesh)
setting ent_setskin gives strange results
the uper an down faces gives rare results
in D3DXCreateMeshFVF i need to add a extra face else i get strange results
creating a dummy instead of a mdl make's it crashe(dont know why)
the release dont work stil dont know why but in the manual there was somthing about that you need to realease it
last thing i thing i stoping playing with it for a while because its way to hot here and got lots of other projects but i learnt realy much (never used memcpy)
hope you got some nice results becuase i got some times realy strange objects
Last edited by flits; 07/02/10 16:26.
"empty"
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Re: [unpaid]Micro-tutorial of D3D mesh-generation
[Re: flits]
#331283
07/03/10 05:59
07/03/10 05:59
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
OP
Expert
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Joined: Feb 2008
Posts: 3,232
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Finally got it figured out, and now working. There were a couple of MAJOR flaws in my code, as stated below. 1> Storing the static vertex data as shorts. BAD! This led to occaisional data corruption as 'chopping' up the long data into shorts was killing some negative numbers (mostly -1). 2> Static index data: Stuffed! My index data was based on data extracted from a real MDL. BUT, I was only reading ONE BYTE per face, when I should have been reading THREE SHORTS per face. DUH! Dunno how I managed that. 3> There may have been some othor minor issues, but I cant remember them. So here is a working code that builds a 100x100x0 panel-shaped mesh, and stores it into a global pointer. (cause you only need it once, and ent_clone duplicates) (FYI texture mapping is working, front side is whole texture,
and the backside is a mirror imiage of it, so it is kindof see-through)
//this event needed to release all custom meshes to prevent on-exit-crashes
void exit_event() { me = NULL; while(me=ent_next(me)) ent_setmesh(me,0,0,0); }
LPD3DXMESH *panel_mesh;
void make_panelmesh_startup()
{ ///////////////////////////////////////////////////////////////////////////////////////
// static hard-coded mesh ////
static short Ibuff[12] ={ 0,2,1,0,3,2,3,1,2,3,0,1 };
static byte Vbuff[224] ={ 0,128,95,56,0,0,200,66,47,0,200,66,0,0,128,191,0,0,0,128,28,
10,15,53,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,95,
56,0,0,200,194,47,0,200,66,0,0,128,63,0,0,0,128,28,10,15,181,0,0,0,0,0,0,128,63,0,0,0,
0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,95,184,0,0,200,194,47,0,200,194,0,
0,128,191,0,0,0,128,28,10,15,53,0,0,128,63,0,0,128,63,0,0,128,63,0,0,128,63,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,128,95,184,0,0,200,66,47,0,200,194,0,0,128,63,0,0,0,128,28,10,
15,181,0,0,128,63,0,0,0,0,0,0,128,63,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
///////////////////////////////////////////////////////////////////////////////////////
LPDIRECT3DDEVICE9 pd3d_dev = pd3ddev; LPD3DXMESH pMesh;
D3DVERTEX* pVertBuff; short* pFaceBuff;
///////////////////////////////////////////////////////////////////////////////////////
if(SUCCEEDED(D3DXCreateMeshFVF(0x4,0x4,D3DXMESH_MANAGED,D3DFVF_D3DVERTEX,pd3d_dev, &pMesh)))
{ if(SUCCEEDED(pMesh->LockVertexBuffer(0x0, &pVertBuff)))
{ memcpy(pVertBuff, Vbuff, sizeof(D3DVERTEX)*0x4);
pMesh->UnlockVertexBuffer(); }
if(SUCCEEDED(pMesh->LockIndexBuffer(0x0, &pFaceBuff)))
{ memcpy(pFaceBuff, Ibuff, (sizeof(short)*0x3)*0x4);
pMesh->UnlockIndexBuffer(); } }
panel_mesh = pMesh;
}
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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