textures

I'm trying to retrieve the pixel information for an alpha-only texture via glGetTexImage. The problem is, the glGetTexImage-Call seems to read more data than it should, leading to memory corruption and a crash at the delete[]-Call. Here's my code: int format; glGetTexLevelParameteriv(target,0,GL_TEXTURE_INTERNAL_FORMAT,&format); int w; int h; glGetTexLevelParameteriv(target,0,GL_TEXTURE_WIDTH,&w); glGetTexLevelParameteriv(target,0,GL_TEXTURE_HEIGHT,&h); if(w == 0 || h == 0) return false; if(format != GL_ALPHA) return false; unsigned int size = w *h *sizeof(unsigned char); unsigned char *pixels

I want to add images to one face of a cube, possibly using a 2d canvas element as the face texture. Here is my code, but I can't get the result I want. The face using the canvas as a texture is blank, the other faces use a THREE.ImageUtils.loadTexture and they're fine. var renderer, camera, scene; var canvas = document.createElement("canvas"); var context = canvas.getContext("2d"); var image0 = new Image(); var image1 = new Image(); image0.onload = function() { context.drawImage(image0, 0, 0); }; image0.src = 'textures/nx.jpg'; var texture = new THREE.Texture(canvas); texture.needsUpdate =

I am trying to get the maximum texture size limit in Android for OpenGL 2.0. But I've found that the next instruction only works if I'm currently within the OpenGL Context, in other words I must have a GL Surface and a GL Renderer, etc, which I don't want. int[] maxTextureSize = new int[1]; GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_SIZE, maxTextureSize, 0); So I came with the next algorithm, which gives me the maximum texture size without having to create any surface or renderer. It works correctly, so my question is if this will work with all Android devices, and if anyone can spot any bug,

I have a house model in my game, and I have some materials for the house geometry. There is a material for the wall of the house, and I have a texture-map-image to show the bricks. var mat = new THREE.MeshPhongMaterial( { ambient: 0x969696, map: THREE.ImageUtils.loadTexture( 'textures/G/G0.jpg' ), overdraw: true,combine: THREE.MultiplyOperation } ); In this way above, the texture map appears like GL_CLAMP I want it to show like GL_REPEAT . What should I do? If you can not see the images check this . I have posted a full working example at: http://stemkoski.github.com/Three.js/Texture-Repeat

So what I'm trying to do is to generate a background image for my game by drawing pixmaps to a texture. So far I can do that, but now I need to draw the pixmaps flipped in the X or Y axis to the texture. However I can't find anything to do so. The pixmap class does not provide that functionality. Then I thought I could draw a flipped texture region to a texture, but so far I haven't found how to do so. So I was wondering how can I do such a thing, would it be possible to flip a png image with other java libraries and then create a pixmap from that flipped image? I also don't see other option

I am using a texture atlas to hold a sequence of images. When mapping to a mesh with MeshLambertMaterial , using Texture.offset and Texture.repeat works beautifully to cut the subtexture out of the entire image. However, using the exact same texture instance for a PointCloudMaterial renders the particles with the entire atlas, not just the selected subimage. I tried to follow the three.js source code, but the documentation is scarce. Is there a workaround for this better than using canvases to chop up the image? Edit: As requested, a work-in-progress is available at http://jnm2.com/minesweeper

I have the following cube coordinates: var vertices = [ // Front face -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, // Back face -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, // Top face -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, // Bottom face -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, // Right face 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, // Left face -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0 ]; And these are the texture coordinates: var textureCoordinates = [

I need to handle many objects which share only a few textures. Defining and loading textures one by one manually (as described in another post on SO ) does not feel right... even more so since there's no switch (index) {case:...} statement in WebGL. So I wanted to pass the texture to use for a vertex as a vertex attribute, and use this number as an index into some "array of textures" in the fragement shader. But the OpenGL wiki on Samplers (not quite the perfect reference for WebGL, but the one I found) says: A variable of sampler can only be defined in one of two ways. It can be defined as a