texturing

问题 Very basic OpenGL texture creation code: int width, height; BYTE * data; FILE * file; // open texture data file = fopen( filename, "rb" ); if ( file == NULL ) return 0; // allocate buffer width = 256; height = 256; data =(BYTE*) malloc( width * height * 3 ); // read texture data fread( data, width * height * 3, 1, file ); fclose( file ); glGenTextures( 1, &texture ); glBindTexture( GL_TEXTURE_2D, texture ); //gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height, GL_RGB, GL_UNSIGNED_BYTE, data )

问题 Is there a way to blend 2 textures in a gradient manner? ex. first textures starts at top and goes to the bottom, and second one starts bottom and goes top. I want to make them loose opacity like in a gradient to create a smooth connection. Is it possible? Maybe there is some other way to create such textures? The problem is that the difference in heights in my terrain does not look really well - in one square area, one triangle has a different texture than the other. 回答1: For every terrain

问题 I'm trying to repeat a 16x16 texture on a plane, but when I set the texture to repeat I get the following result: The texture is shown correctly in the bottom left of the plane, but it looks as though the top and right edges are stretched across the rest of the plane. So far I've been unable to find out why it does this. This is the code: function addTerrain(){ var texture = THREE.ImageUtils.loadTexture( "tex/tex.png" ); texture.WrapS = texture.WrapT = THREE.RepeatWrapping; texture.repeat.set

问题 I am using opengl (fixed-function pipeline) and I'm drawing potentially hundreds of thousands of points, and labeling each with a text label. This question is about whether I'm doing this in a reasonable way, and what I can expect in terms of speed. The text labels are drawn by creating a texture coordinate rectangle for each character, and texturing the rectangles using a small font bitmap (each character is about 5x13 pixels in the texture). In a test file, I have about 158,000 points,

问题 This works fine in Canvas3D, but not in QQuickFramebufferObject. My code I've based my testcase on the textureinsgnode sample app bundled with Qt. Since mine is a derived work, I have to first post the license terms here: /**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file

问题 The only way I know is to use a slider: import maya.cmds as cmds cmds.colorSliderGrp( 'polygonColour', label = "Colour", hsv = ( 1, 1, 1 ) ) Then taking the RGB value from that: rgb = cmds.colorSliderGrp( 'polygonColour', query = True, rgbValue = True ) And then assigning a material to the polygon and giving that material the color: myShader = cmds.shadingNode( 'lambert', asShader = True, name = "polygonMaterial" ) cmds.setAttr( 'polygon1' + ":blockMaterial.color", rgb[ 0 ], rgb[ 1 ], rgb[ 2

问题 I'm using lodePNG to load texture from a png file but the program crashes when I load the texture. char* filename = "texture.png"; unsigned width, height; std::vector<unsigned char>image; GLuint texture[1]; //decode unsigned error = lodepng::decode(image, width, height, filename); if(error) std::cerr << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl; glBindTexture(GL_TEXTURE_2D, texture[0]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL

问题 This is a very vague problem, so please feel free to clarify anything about this project. I'm working on a very large application, and recently a very perplexing bug has cropped up regarding the texturing. Some of the textures that we are loading are being loaded - I've stepped through the code, and it runs - but all OpenGL renders for those textures is a weird Pink/White striped texture. What would you suggest to even begin debugging this situation? The project is multithreaded, but a mutex

问题 I can't seem to be able to have both texture2D() and textureCube() in one shader. When I do, nothing shows up and there is no error. I tried this both with my own shader loader and the Apple GLSL shader builder and the same thing happens. It happens even if I have textureCube() in the vertex shader and texture2D() in the fragment. They seem to work fine by themselves, but as soon as they're called together, no matter in which order, nothing shows up. 回答1: You need to bind both textures as

问题 I've been programming OpenGL on Windows/SDL for a few years and am able to do quite a lot of advanced things with it. I've switched over to Android and libgdx and over the past few days have tried to put a simple demo together, just a spinning cube. Using libgdx's ObjLoader and Mesh classes, I loaded a cube mesh exported from blender(with normals and uv coords), and tried to apply a texture, and it draws a cube, but seems to only uses one texel from the texture to cover the whole model. I've