basically indices are just an array of numbers which tell OpenGL which bit of vertex data to use, so if you had a triangle on screen with 3 verts the indices would be 0,1,2.
The Red Book has a good explination of how it all works infact.
Vertex Array problem
Author
Yes, I managed to figure that out. I do even save them in the level file format I am using, though I did not use the term "indices" for that list.
However.. I put that in, but whenever I have the indice assignment activated, I get a strange crashing error when loading textures.. with it disabled, the game runs fine, though without indices and thus no landscape... Blargh.. :)
However.. I put that in, but whenever I have the indice assignment activated, I get a strange crashing error when loading textures.. with it disabled, the game runs fine, though without indices and thus no landscape... Blargh.. :)
Author
Nevermind, found the error. Now it loads correctly. But.. I see nothing of the landscape (as compared to prior this, when I at least saw something that resembled polygons). Here follows the new code I have:
Loading of indices. I have stored the indices in the level format file, and when I read the number of faces (which is equivalent to (number of indices / 3), I assign the "indice" list of this object the correct size.
Next, filling in the indice list for this object. It reads the values from the file (they are stored correctly, did multiple tests) and puts them in the indice list.
Finally, the rendering function, which now looks like this:
I am beginning to suspect that I have to send the texture coordinates as well, though should it not work without those and just draw a color I specify instead?
Loading of indices. I have stored the indices in the level format file, and when I read the number of faces (which is equivalent to (number of indices / 3), I assign the "indice" list of this object the correct size.
// Read face number for this object and allocate memory.} else if (!strcmp(strWord, MIS_NUM_FACES)) { fscanf(m_FilePointer, " %d", &pObject->numOfFaces); pObject->pFaces = new tFace [pObject->numOfFaces]; // Create the indice list. pObject->indices = new int [pObject->numOfFaces * 3];Next, filling in the indice list for this object. It reads the values from the file (they are stored correctly, did multiple tests) and puts them in the indice list.
// Read object faces.} else if (!strcmp(strWord, MIS_FACE)) { fscanf(m_FilePointer, " %d", &indx); fscanf(m_FilePointer, " %d %d %d", &(pObject->pFaces[indx].vertIndex[0]), &(pObject->pFaces[indx].vertIndex[1]), &(pObject->pFaces[indx].vertIndex[2])); // Fill in the data in the indice list. pObject->indices[d++] = pObject->pFaces[indx].vertIndex[0]; pObject->indices[d++] = pObject->pFaces[indx].vertIndex[1]; pObject->indices[d++] = pObject->pFaces[indx].vertIndex[2];Finally, the rendering function, which now looks like this:
void RenderLandscape(){ bool useDetailTexture = false; // Activate the necessary Vertex Array properties. glEnableClientState(GL_VERTEX_ARRAY); for (int i = 0; i < g_3DModel.numOfObjects; i++) { // Draw only ground objects. if (bItemList != false) continue; // Make sure we have valid objects just in case. (size() is in the vector class). if(g_3DModel.pObject.size() <= 0) break; // Get the current object that we are displaying. t3DObject *pObject = &g_3DModel.pObject; // Check visibility based on distance from object to player. if (!ObjectDistanceCalc(player.vCharMove, pObject)) continue; ActivateDetailTexturing(); // Does the material applied to this object have a detail texture? if (g_TextureDetail[pObject->materialID] < 666) { useDetailTexture = true; } else { useDetailTexture = false; } // Set up the detail texturing parameters. if (useDetailTexture) { SetupDetailTexturing(g_Texture[pObject->materialID], g_TextureDetail[pObject->materialID]); } else { SetupDetailTexturing(g_Texture[pObject->materialID], -1); } // Turn on backface culling. glEnable(GL_CULL_FACE); // Check if the object is to be rendered without culling. if (!pObject->doCulling) glDisable(GL_CULL_FACE); // Set translucency and color. if (pObject->transPercent < 1.0f) { glColor4f(1.0f, 1.0f, 1.0f, pObject->transPercent); glBlendFunc(GL_SRC_ALPHA, GL_ONE); glEnable(GL_BLEND); } else { glColor4f(1.0f, 1.0f, 1.0f, 1.0f); glDisable(GL_BLEND); } // Shiny objects should have specular coloring applied. if (pObject->ShinyObj) { glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, SunAmbience); glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, &specularShine); } else { GLfloat noSpecular[] = {0, 0, 0, 1.0f}; float noShininess = 0.0f; glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, noSpecular); glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, &noShininess); } // Set up the Vertex Array lists. glVertexPointer(3, GL_FLOAT, 0, pObject->vertexArray); // Draw the Vertex Array lists. glDrawElements(GL_TRIANGLES, pObject->numOfFaces, GL_UNSIGNED_BYTE, pObject->indices); // Disable detail texturing. DisableDetailTexturing(); // Disable possible set blending. if (pObject->transPercent < 1.0f) glDisable(GL_BLEND); } glDisableClientState(GL_VERTEX_ARRAY);}I am beginning to suspect that I have to send the texture coordinates as well, though should it not work without those and just draw a color I specify instead?
Shouldn't this be :- (And are you storing them as bytes or unsigned shorts/unsigned ints ?
glDrawElements(GL_TRIANGLES, pObject->numOfFaces * 3, GL_UNSIGNED_BYTE, pObject->indices);
glDrawElements(GL_TRIANGLES, pObject->numOfFaces * 3, GL_UNSIGNED_BYTE, pObject->indices);
Author
I am storing them as unsigned ints.. made the change from GL_UNSIGNED_BYTE to GL_UNSIGNED_INT in the vertex array. I guess I could use something with less memory footprint.
I should not do ->numOfFaces * 3, that's incorrect since I only want to draw the number of faces for the object.
I should not do ->numOfFaces * 3, that's incorrect since I only want to draw the number of faces for the object.
Author
Heh.. you were right.. multiplying the pObject->numOfFaces by 3 did the trick, though I don't understand why.. hehe..
THANKS TO EVERYONE!! :)
Now for the texture coordinates ;)
THANKS TO EVERYONE!! :)
Now for the texture coordinates ;)
Quote:Original post by azjerei
I am storing them as unsigned ints.. made the change from GL_UNSIGNED_BYTE to GL_UNSIGNED_INT in the vertex array. I guess I could use something with less memory footprint.
I should not do ->numOfFaces * 3, that's incorrect since I only want to draw the number of faces for the object.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/glfunc01_1kz7.asp
The count is number of elements to be rendered - not the number of faces. So in essence its the total number of indices - not the total number of faces.
Author
Ok :)
Got texture coordinates to work as well, so the scene is textured. The FPS was increased to about double from before, which is great.
Though, now I have two small problems:
1. How to use my vertex normals here? I have no indice list for the vertex normals I use.. Is that even possible?
2. My multitexturing seems to be unfunctional now.. Any suggestions? I guess it is the coordinates for the detail texture that isn't quite working as it should now that I pass texture coordinates via the Vertex Array system.
Got texture coordinates to work as well, so the scene is textured. The FPS was increased to about double from before, which is great.
Though, now I have two small problems:
1. How to use my vertex normals here? I have no indice list for the vertex normals I use.. Is that even possible?
2. My multitexturing seems to be unfunctional now.. Any suggestions? I guess it is the coordinates for the detail texture that isn't quite working as it should now that I pass texture coordinates via the Vertex Array system.
Hi,
You will probably have to recalculate the normals and use glNormalPointer. Regarding multitexturing - you can do it using glClientActiveTextureARB which you will have to load using wglGetProcAddress if you are using windows.
http://www.hmug.org/man/3/glClientActiveTextureARB.html
You will probably have to recalculate the normals and use glNormalPointer. Regarding multitexturing - you can do it using glClientActiveTextureARB which you will have to load using wglGetProcAddress if you are using windows.
http://www.hmug.org/man/3/glClientActiveTextureARB.html
Author
Ok, thanks.
Though.. having done a few tests, I don't really see any speed-up at all.
With only the landscape rendered using vertex arrays (not regular objects like trees, fences, boxes etc.), I get an FPS of ~90-100. When rendering everything using vertex arrays, I get an FPS of ~70-80.
Prior to installing this, I got an FPS between 40 and 100 depending on the amount of objects being drawn (had 41 in the scene, which were rendered all at once at certain locations, with a total face count of about 2000).
How can faces be culled now? Someone said that it can be done, but theoretically, I cannot really see how, unless there is an extension for that.
Though.. having done a few tests, I don't really see any speed-up at all.
With only the landscape rendered using vertex arrays (not regular objects like trees, fences, boxes etc.), I get an FPS of ~90-100. When rendering everything using vertex arrays, I get an FPS of ~70-80.
Prior to installing this, I got an FPS between 40 and 100 depending on the amount of objects being drawn (had 41 in the scene, which were rendered all at once at certain locations, with a total face count of about 2000).
How can faces be culled now? Someone said that it can be done, but theoretically, I cannot really see how, unless there is an extension for that.
This topic is closed to new replies.
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