How to create a simple quad (by code) inside the 3D world? for gameplay reasons.

[argoon]

Hello guys, for a very long time now, i've been trying to create a simple quad programatically in the engine, but I just don't know how that is done! I've browsed the source code for answers, but the geometry code I see is just to complicated for my feeble mind. I see stuff about windings and vertices but nothing direct.   

I tried looking at the gameRenderWorld debug code but again it looks way low level for me. Would someone be so kind to explain with code how to create a simple static quad in the 3D world in idtech4?

I know how to import a quad/model but what I really want is to create a quad dynamically by c++/opengl code.

Any help appreciated cheers.

 

[argoon]

If this community doesn't share knowledge it will never grow that's for sure.

So here is what I found on how to create a simple colored quad at run time. For now is not what I really wanted, what I want is to create a quad at run time that I can apply a material, but is a start.

So again if someone knows how to create a 3D quad that can have a material at run time and doesn't mind sharing said knowledge, please do so, I will appreciate it immensely. Thanks.

Simple colored quad (shows double sided)

Code: [Select]

idWinding w;
idVec3 vert[4];
int size = 20;
vert[0] = idVec3(0, 0, 0); // this is the world origin
vert[1] = idVec3(0, size, 0);
vert[2] = idVec3(0, size, size);
vert[3] = idVec3(0, 0, size);
w.AddPoint(vert[0]);
w.AddPoint(vert[1]);
w.AddPoint(vert[2]);
w.AddPoint(vert[3]);
gameRenderWorld->DebugPolygon(colorRed, w);

 

 

[argoon]

Player Icons/model sprite to the rescue!!!

Because I don't like multiplayer, I deleted many of the MP code, because of that I also deleted the player icon code, yes I know it was dumb, but I didn't knew better at the time...

So I remembered those icons and went to see on the original fhdoom source code how they were done, I saw they use the model sprite! so I decided to use the code to create sprites easely ingame.

Here is the main code that creates the sprites.  Will show the full code if asked or like me just see how the player icons were made.

Code: [Select]

idSprite::idSprite(c_string matName, const vec3 &origin, const mat3 &axis, f32 width, f32 hight) {
FreeSprite();

ZeroStruct(spriteEnt);

spriteEnt.origin = origin;
spriteEnt.axis = axis;
spriteEnt.shaderParms[SHADERPARM_RED] = 1.0f;
spriteEnt.shaderParms[SHADERPARM_GREEN] = 1.0f;
spriteEnt.shaderParms[SHADERPARM_BLUE] = 1.0f;
spriteEnt.shaderParms[SHADERPARM_ALPHA] = 1.0f;
spriteEnt.shaderParms[SHADERPARM_SPRITE_WIDTH] = width;
spriteEnt.shaderParms[SHADERPARM_SPRITE_HEIGHT] = hight;
spriteEnt.hModel = renderModelManager->FindModel("_sprite");
spriteEnt.callback = NULL;
spriteEnt.numJoints = 0;
spriteEnt.joints = NULL;
spriteEnt.customSkin = 0;
spriteEnt.noShadow = true;
spriteEnt.noSelfShadow = true;
spriteEnt.customShader = declManager->FindMaterial(matName);
spriteEnt.referenceShader = 0;
spriteEnt.bounds = spriteEnt.hModel->Bounds(&spriteEnt);

spriteHandle = gameRenderWorld->AddEntityDef(&spriteEnt);
}