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7
votes
2answers
321 views

Must I worry about quad-based rendering in real world scenarios?

Most of the time in the first chapters of a random book about rasterization and rendering techniques, I find some phrases about a triangle-based rendering system and a quad-based one. I have never ...
5
votes
1answer
303 views

How can I draw a perspective-correct quad?

I'm trying to draw a quad in 2D (in SharpDX, but that is basically XNA). But texture correction is not working, and I'm getting only an affine textured quad. I'm using BasicEffect to render it. ...
4
votes
1answer
562 views

Quads Vs Triangles

I'm curious to know which is better for games? Quads or Triangles? Wouldn't quads be better for rendering performances and smoothing out tessellation?
3
votes
1answer
89 views

Texturing a quad

Drawing a quad with a texture mapped to it with the fixed OpenGL pipeline is one of the easiest things to do in OpenGL. And for some madmaking, mysterious, dumb reason I can't get it to work. I ...
3
votes
2answers
380 views

Tessellating/Subdividing a quad

I am creating a quad that starts as a single quad, then divides itself multiple times (from 1 -> 4 -> 16 -> 64 -> 256 etc) but I have encounted an issue. When I get to 64 sub divisions only 16 quads ...
2
votes
3answers
3k views

Mesh with quads to triangle mesh

I want to use Blender for making models yet realize some of the polygons are not triangles but contain quads or more (example: cylinder top and bottom). I could export the the mesh as a basic mesh ...
2
votes
1answer
165 views

re-using objects

I'm working with openGL ES 2.0 on Android and I've created a custom 'Quad' class. This allows me to make a sprite object like so: Quad mySprite = new Quad(); mySprite.setSize(w,h); ...
1
vote
2answers
473 views

How to flip a quad (openGL es 2.0 Android / Java)

bHow would one go about 'flipping' a quad i.e., either horizontally or vertically? (Just a single quad, not everything in view). I know how to rotate a quad, this is my rotation method: public void ...
1
vote
1answer
228 views

Quad Rendering Issue

I am fairly new to using Quads, so I'm not sure how I can properly describe this issue in all honesty or to even hazard a guess as to why it's happening, so I have a screenshot to illustrate. So ...
1
vote
1answer
241 views

Drawing many quads XNA

I asked a similar question to this yesterday and gained some knowhow but I'm a little confused: If I have many quads that contain Vertices and Indices that are positioned to to form a bigger ...
1
vote
2answers
3k views

Rotating a Quad around it center

How can you rotate a quad around its center? This is what im trying to do but it aint working: GL11.glTranslatef(x-getWidth()/2, y-getHeight()/2, 0); GL11.glRotatef(30, 0.0f, 0.0f, ...
1
vote
0answers
129 views

Drawing cube map and texture array on NVidia cards doesn't work

I have small problem with shadow maps preview. After binding shadow framebuffer I bind proper texture to store depth in it and then render the whole scene. When I read that values in shader to ...
1
vote
0answers
262 views

Matrix.CreateBillboard centre rotation problem

I'm having an issue with Matrix.CreateBillboard and a textured Quad where the center axis seems to be positioned incorrectly to the quad object which is rotating around a center point: Using: ...
0
votes
3answers
433 views

OpenGL - How to draw a transition of two textures on one quad?

I know when drawing a rectangle, if we select red and draw two vertices, and then select yellow and draw the other two vertices, the entire rectangle will show a nice transition of color between those ...
0
votes
1answer
107 views

Re-using one texture for multiple OpenGL Quads

I've been looking over my code and I'm just wondering, when I set a texture for say, 20 quads that need to use the same texture, it seems as though I'm creating a new texture each time...... surely ...
0
votes
3answers
186 views

Rotating each quad in a batch separately?

Background In my app I use the following code to rotate my quad: Code //Rotate the quad Matrix.setIdentityM(mRotationMatrix, 0); Matrix.translateM(mRotationMatrix, 0, centreX, centreY, 0f); ...
0
votes
2answers
136 views

How do I merge quads to simplify a heightmap?

I'm trying to improve my frame rates. My map has an area of 200 * 200 vertices, where each vertex has a height. 200 * 200 = 40000 vertices per frame. I'd like to create a method to simplify the ...
-1
votes
0answers
25 views

changing the color of gl_quads inside loop

I am trying to make a chess board with black and with quads , it should display black and whiote alternate quards but its not doing that for some reason here is my code #include <glut.h> void ...