DeleD Community Edition

[GhostManZero]

Hello, i'm trying to render a DMF map using OpenGL, i loaded a file named "map.dmf" using the CDMFParser code from the Various Products section at delgine.com, and i'd like to know how should i do to render it all.
I am currently doing something like this:

for(i = 0; i < dmf.numObjects; ++i)
{
glBegin(GL_LINE_STRIP);
for(int j=0; j < dmf.objectList[i].numVertices; j++)
{
glColor3ub(rand() % 255,rand() % 255, rand() % 255);
glVertex3f(dmf.objectList[i].vertices[j].x,dmf.objectList[i].vertices[j].y,dmf.objectList[i].vertices[j].z);
}
glEnd();
}

i know that the geometry isnt drawed correctly. What should i do to draw the geometry correctly? should i use Triangle Strips? is there something wrong with the for loops in the code? I hope someone can help me, thank you all for spending some time reading this message, thanks in advance!

[Jeroen]

Hi there GhostmanZero, and welcome!

Your code looks OK to me, except for one thing: the GL_LINE_STRIP. I would use GL_POLYGON or GL_LINE_LOOP to render the polygons. Geometry in DMF files isn't stored in triangle strips but rather as a polygon soup. Hope this helps out!

[Daaark]

While polygons are okay to just flat out render the thing, if you want to get it renering fast you are going to have to do a few more steps.

1) Triangulate the map
2) Material Sort
3) Vertex Arrays instead of immediate mode

[GhostManZero]

Well, i still have a problem with the rendering, i tryed polygon rendering, Line Loop rendering and Triangle Strip rendering, and none of them work well.
For you to see how it is showing up:

www.ghostdev.gamedev-pt.net/Downloads/dmfload1.jpg
www.ghostdev.gamedev-pt.net/Downloads/dmfload2.jpg
www.ghostdev.gamedev-pt.net/Downloads/dmfload3.jpg

[GhostManZero]

Forgot to tell you how i do the loading and rendering of the whole level:
cout << "Loading DMF File...";
dmf_file_t dmf;
dmf_object_t *objPtr;
dmf_polygon_t *polyPtr;
unsigned int result;
unsigned int i, j, k, m;
result = ReadDMF(&dmf, "map.dmf", ProgressCallback, TextureLoadCallback);
if(DMF_NO_ERROR != result)
{
cout << "FAILED!" << endl;
cout << "Releasing Rendering device...";
Renderer.Release();
gluDeleteQuadric(GQO);
cout << "OK!" << endl;
cout << "Releasing Texture devices...";
if(UseTGALoader)
TGATexDevice.Release();
if(UseBMPLoader)
BMPTexDevice.Release();
cout << "OK!" << endl;
cout << "Releasing Networking device...";
WinSockNetwork.Release();
cout << "OK!" << endl;
cout << "Execution terminated." << endl;
system("PAUSE");
exit(1);
}
TranslateDMF(&dmf, 0.f, 0.f, 0.f);
RotateDMF(&dmf, 90.f, 0, 1, 0);
ReverseDMF(&dmf);
TriangulateDMF(&dmf);
if(dmf.version >= DMF_VERSION_1_1)
ScaleDMF(&dmf, 1.f, 2.f, 2.f, 1.f, -1.f);
else
ScaleDMF(&dmf, 1.f, 2.f, 2.f, 1.f, 1.f);
cout << "OK!" << endl;
cout << "Entering Main Loop" << endl;
//POSITION CAMERA
while(1)
{
//DO NECESSARY STUFF TO START RENDERING
for(i = 0; i < dmf.numObjects; ++i)
{
glBegin(GL_POLYGONS); //or GL_LINE_LOOP or GL_TRIANGLE_STRIP
for(int j=0; j < dmf.objectList[i].numVertices; j++)
{
glColor3ub(rand() % 255,rand() % 255, rand() % 255);
glVertex3f(dmf.objectList[i].vertices[j].x,dmf.objectList[i].vertices[j].y,dmf.objectList[i].vertices[j].z);
}
glEnd();
}
//OTHER STUFF
}

[Jeroen]

It seems that your render loop is just fine. Maybe the error is in the steps before rendering. I see you're performing a bunch of manipulations (like triangulation) on the DMF. You could try to do without those manipulations and see what you get?

[Mr.Fletcher]

I'm not sure about the Loader, but it seems to me that there should be a Polygon-Loop, too. With that code, you render every vertex of every object as a GL_POLYGON. Try to figure out how the loader loads the polygons.
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[GhostManZero]

The loader thinks that polygons are texcoords (?)
like:
typedef struct
{
unsigned int numVertices;
unsigned int materialIndex;
unsigned int *indices;
dmf_texcoord_t texcoords[4];

} dmf_polygon_t;
Strange huh?

[Daaark]

Did you normalize the faces? Try disabling backface culling.

[Mr.Fletcher]

[Jeroen]

[GhostManZero]

Tryed the last advice, using this loop:
for(i = 0; i < dmf.numObjects; ++i)
{
glBegin(GL_POLYGONS);
for(j=0; j < dmf.objectList[i].numPolygons; j++)
{
for(k = 0; k < dmf.objectList[i].polygons[j].numVertices; ++k)
{
glVertex3f(
dmf.objectList[i].vertices[dmf.objectList[i].polygons[j].indices[k]].x,
dmf.objectList[i].vertices[dmf.objectList[i].polygons[j].indices[k]].y,
dmf.objectList[i].vertices[dmf.objectList[i].polygons[j].indices[k]].z
);
}
}
}
glEnd();

It doesnt seem to be drawed ENTIRELY correctly, isthere something wrong with this?

[GhostManZero]

Also, how should i get the texture coords?

[Mr.Fletcher]

The glBegin(GL_POLYGONS); Command should come in your Polygons-Loop, so

[Daaark]