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Questions tagged [texture-mapping]

Texture mapping is a method for adding detail, surface texture (a bitmap or raster image), or color to a computer-generated graphic or 3D model.

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Sampling from a texture in OpenGL is black

I'm trying out my hand at graphics, following a tutorial at http://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Tutorial_06 Problem: When I try to texture my cube, my sample is black. Screenshot: http://puu.sh/2JP1H.jpg (note: I set blue =…
nate
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Textured point sprites in OpenGL 4.3

Is there a way to apply a texture to a point sprite in OpenGl 4.3? I've searched around the internet but most tutorials and guides are using older versions that still support: glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_FALSE); However this…
IntSec
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OpenGL binding textures to vertex buffer objects (with CG Shaders)

I'll get straight to the point: I have created a structure for my vertices: struct Vertex3D { Vector3D position; Vector2D textureCoordinate; Vector3D normal; } I then import a particular *.dae file and bind it to a OpenGL Vertex Buffer,…
VoltairePunk
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How to catch glTexImage2D error when resolution is incompatible?

I am trying to catch the error that comes from incompatible image texture resolution in glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, imgdata); 1. Compatible resolution, working fine = 1024x1024,…
maxpayne
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How to load a texture onto a circle with OpenGL ES

I am facing problems on loading a texture onto a circle. My circle is made with a triangle fan. It gives a bad output. Original Image: The Result : My code: public class MyOpenGLCircle { private int points=360; private float…
Siddharth-Verma
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Texture mapping on a cylinder

I want to apply an uniform checkerboard texture to a cylinder surface of height h, and semiradii (a,b). I've implemented this shader: Vertex shader: varying vec2 texture_coordinate; float twopi = 6.283185307; float pi=3.141592654; float ra =…
linello
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How to export a reconstructed 3D model with texture using insight3d

I am using the open-source structure-from-motion program: insight3D to reconstruct a 3D model from a set of 2D images. I was able to export the resulting model as an VRML (.wrl) file but the texture and texture coordinates were not included when I…
Ken Toh
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Drawing a polygon with color in OpenGL causes texture colors to change

I'm working on a simulation program that draws points and other primitives on top of a large 2D rectangle with a texture mapped onto it. The problem is, when I draw a polygon and specify a color for the vertices using glColor3f, that color appears…
Timoteo
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FBO: render to texture, wrong texture mapping when drawing rendered texture

I'm using OpengGL on a Mac OS X application to draw texture on a NSOpenGLView. The app is a movie player. It decodes movie frames into CVOpenGLTextureRef (which are OpenGL texture) and I draw them directly to the view using GL_QUAD. Everything works…
Andrea3000
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Render face of cube map to a quad

I have a cube map texture in OpenGL, and I'd like to render one face of the cube to a single quad. What texture coordinates should I use? To be concrete, what coordinates should I pick to render the "GL_TEXTURE_CUBE_MAP_POSITIVE_X" face? Or if I…
Carl Veazey
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how to draw image in opengl android

i have to draw bitmap in to the my live wallpaper using this code but image will not loaded its showing null pointer exception. public class Square { private FloatBuffer vertexBuffer; // buffer holding the vertices private float vertices[]…
user1127616
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Imitate Polygon Stipple with OpenGL ES on iOS

I want to fill a concave polygon with a simple repeating pattern. I can already draw the polygon properly, unfortunately I am having problems with filling it. In OpenGL I could do this easily with POLYGON_STIPPLE. However this functionality is not…
gebirgsbärbel
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How to correctly find UV on sphere

I have a sphere and a texture for it. Texture consist of 16 tiles of zoom = 2 from OSM. Tile size is 256x256. At top and bottom I added space to cover area in ranges [90, 85.0511] and [-85.0511, -90], proportionally. So texture size was…
Dmitry
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texture mapping using bilinear interpolation

I have been trying to achieve texture mapping using the bilinear interpolation method.I have been trying to rasterize a triangle thus i first find the barycentric weights and then try to interpolate the uv co-ordinates but have got no success. Could…
noddy
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Converting ARAnchors to SCNGeometry with texture image is stretching

I am using WorldTracking in ARKit and converting ARAnchors to SCNNodes to display it later using SceneView. Here is the code for adding new anchor and I am adding new node on each anchor added. func renderer(_ renderer: SCNSceneRenderer, nodeFor…
Zia ur Rehman
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