opengl

问题 I'm using python 3 with pygame and OpenGL to try to accomplish what I thought it would be a simple task: Drawing a rectangle. The idea is to have a white rectangle over (or bellow) a transparent texture, but whenever I add the texture to the screen the rectangle vanishes, whether I render it before or after the texture. Bellow is a sample code displaying the problem (you can add any Player1.png image of your choice, the problem will remain the same - at least in my computer) import pygame

问题 I'm using python 3 with pygame and OpenGL to try to accomplish what I thought it would be a simple task: Drawing a rectangle. The idea is to have a white rectangle over (or bellow) a transparent texture, but whenever I add the texture to the screen the rectangle vanishes, whether I render it before or after the texture. Bellow is a sample code displaying the problem (you can add any Player1.png image of your choice, the problem will remain the same - at least in my computer) import pygame

问题 I'm trying to render a scene with OpenGL 2.1 but the borders on overlapping shapes are weird. I tested some OpenGL initialisations but without any change. I reduce my issue to a simple test application with 2 sphere with the same result. I tried several things about Gl_DEPTH_TEST, enable/disable smoothing without success. Here is my result with 2 gluSphere : We can see some sort of aliasing when a line will be enough to separate blue and red faces... I use SharpGL but I think that it's not

问题 I'm trying to render a scene with OpenGL 2.1 but the borders on overlapping shapes are weird. I tested some OpenGL initialisations but without any change. I reduce my issue to a simple test application with 2 sphere with the same result. I tried several things about Gl_DEPTH_TEST, enable/disable smoothing without success. Here is my result with 2 gluSphere : We can see some sort of aliasing when a line will be enough to separate blue and red faces... I use SharpGL but I think that it's not

问题 eI'm trying to compile a c++ openGL program using libGL and freeglut3. Im trying: g++ main.cpp -w -lglut -lGl -o bin/app or g++ main.cpp -w -lglut -lGL -o bin/app Which results in: /usr/bin/ld: cannot find -lGl collect2: error: ld returned 1 exit status Makefile:16: recipe for target 'all' failed make: *** [all] Error 1 I'm on: Ubuntu 16.04 LTS GCC: gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2) libGL.so /usr/lib/x86_64-linux-gnu$ find libGL.so libGL.so I installed: freeglut3 freeglut3

问题 I'm trying to my desktop image capture. (All images, including the desktop output to the monitor) It's easy using window API (BitBlt or CImageClass) and it's not the way I want. I want do it using opengl. so I found glReadPixel funtion and window TRANSPARENT. But it just read pixel own Windows application screen.(Save as bmp file and check) Initialize() glfwSetErrorCallback(errorCallback); if (!glfwInit()) { std::cerr << "Error: GLFW " << std::endl; exit(EXIT_FAILURE); } glfwWindowHint(GLFW

问题 I'm capturing a picture from a webcam with openCV. Then the frame should be transformed into an openGL texture and be shown on the screen. I got the following code but the window remains black. I'm very new to openGL and have no more ideas why it doesn't work. int main () { int w = 800,h=600; glfwInit(); //configure glfw glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint

问题 I've seen other similar questions, and I now that it's usually due to wrong shader loading code, but I've tried with lots of different ways to load them, and I always get this error. Here is the loading code I'm currently using (for the Vertex shader, i do the same for the fragment shader): GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER); std::string VertexShaderCode; std::ifstream VertexShaderStream(vertex_file_path, std::ios::in); if(VertexShaderStream.is_open()){ std::string Line

问题 I am trying to create a square and put a red circle middle of it. As you can see in the simple vert I map (-1, 1) range to (0,1) range: coord = position.xy*0.5 + vec2(0.5,0.5); If you look at the simple.frag, there is this line: if(abs(length(coord - vec2(0.5,0.5))) < 0.3) Thus I am expecting red circle at the middle of square. However this happens: The center of circle is beyond of (0.5, 0.5). If I change that line to this: if(abs(length(coord - vec2(0.0,0.0))) < 0.3) Output is: The center

问题 I am trying to create a square and put a red circle middle of it. As you can see in the simple vert I map (-1, 1) range to (0,1) range: coord = position.xy*0.5 + vec2(0.5,0.5); If you look at the simple.frag, there is this line: if(abs(length(coord - vec2(0.5,0.5))) < 0.3) Thus I am expecting red circle at the middle of square. However this happens: The center of circle is beyond of (0.5, 0.5). If I change that line to this: if(abs(length(coord - vec2(0.0,0.0))) < 0.3) Output is: The center