glu

UnProjected mouse coordinates are between 0-1

由 一个人想着一个人 提交于 2019-12-02 16:10:04
问题 I'm trying to create a ray from my mouse location out into 3D space, and apparently in order to do that I need to "UnProject()" it. Doing so will give me a value between 0 & 1 for each axis. This can't be right for drawing a "Ray" or a line from the viewport, can it? All this is, is a percentage essentially of my mouse to viewport size. If this is actually right, then I don't understand the following: I draw triangles that have vertices that are not constrained from 0-1, rather they are

Force GLUtesselator to generate only GL_TRIANGLES?

由 泄露秘密 提交于 2019-12-01 06:51:02
It's pretty hard to render the data I generate, if I want to use one vertex array format only. I tried to provide GLU_TESS_EDGE_FLAG_DATA callback, but it made my program crash. (also tried without "_DATA" in end, same effect). How can I get it to generate GL_TRIANGLES only? gluTessCallback() , GLU_TESS_EDGE_FLAG : ... if a non-NULL edge flag callback is provided ... fans and strips are converted to independent triangles. This is what I've been using: struct TessContext { ~TessContext() { for( size_t i = 0; i < combined.size(); ++i ) { delete[] combined[i]; } } typedef std::pair< double,

Force GLUtesselator to generate only GL_TRIANGLES?

由 房东的猫 提交于 2019-12-01 04:15:07
问题 It's pretty hard to render the data I generate, if I want to use one vertex array format only. I tried to provide GLU_TESS_EDGE_FLAG_DATA callback, but it made my program crash. (also tried without "_DATA" in end, same effect). How can I get it to generate GL_TRIANGLES only? 回答1: gluTessCallback(), GLU_TESS_EDGE_FLAG : ... if a non-NULL edge flag callback is provided ... fans and strips are converted to independent triangles. This is what I've been using: struct TessContext { ~TessContext() {

Can I use glu with Android NDK

由 久未见 提交于 2019-11-30 01:20:42
问题 I can't seem to include glu.h in my Android NDK project. I'm trying to port existing C++ code to NDK, and it uses glu in a few places (notably gluErrorString ). Does OpenGLES not have glu? Is there a port I can use? If not I can probably remove the calls to things like gluPerspective and so on, but what do I do about gluErrorString ? 回答1: Does OpenGL ES not have glu? No, it doesn't. Look at this: Platform OpenGL Includes collection. Under Android there are only the following headers: OpenGL

Error with GLUT compile in ubuntu [duplicate]

由 吃可爱长大的小学妹 提交于 2019-11-28 08:21:37
This question already has an answer here: What is an undefined reference/unresolved external symbol error and how do I fix it? 33 answers I try to compile some "hello world" glut application: #include <stdlib.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> GLint Width = 512, Height = 512; const int CubeSize = 200; void Display(void) { int left, right, top, bottom; left = (Width - CubeSize) / 2; right = left + CubeSize; bottom = (Height - CubeSize) / 2; top = bottom + CubeSize; glClearColor(0, 0, 0, 1); glClear(GL_COLOR_BUFFER_BIT); glColor3ub(255,0,0); glBegin(GL_QUADS);

Segmentation Fault before main() when using glut, and std::string?

由 三世轮回 提交于 2019-11-27 20:35:58
On 64-bit Ubuntu 14.04 LTS, I am trying to compile a simple OpenGL program that uses glut. I am getting a Segmentation Fault (SIGSEV) before any line of code is executed in main; even on a very stripped down test program. What could cause this? My command line: g++ -Wall -g main.cpp -lglut -lGL -lGLU -o main My simple test case: #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> #include <string> #include <cstdio> int main(int argc, char** argv){ printf("Started\n"); std::string dummy = "hello"; glutInit(&argc, argv); return 0; } When I run the program, the printf at the beginning of

Error with GLUT compile in ubuntu [duplicate]

由 丶灬走出姿态 提交于 2019-11-27 02:09:56
问题 This question already has answers here : What is an undefined reference/unresolved external symbol error and how do I fix it? (32 answers) Closed 4 years ago . I try to compile some "hello world" glut application: #include <stdlib.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> GLint Width = 512, Height = 512; const int CubeSize = 200; void Display(void) { int left, right, top, bottom; left = (Width - CubeSize) / 2; right = left + CubeSize; bottom = (Height - CubeSize) / 2; top

Segmentation Fault before main() when using glut, and std::string?

由 久未见 提交于 2019-11-26 20:24:17
问题 On 64-bit Ubuntu 14.04 LTS, I am trying to compile a simple OpenGL program that uses glut. I am getting a Segmentation Fault (SIGSEV) before any line of code is executed in main; even on a very stripped down test program. What could cause this? My command line: g++ -Wall -g main.cpp -lglut -lGL -lGLU -o main My simple test case: #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> #include <string> #include <cstdio> int main(int argc, char** argv){ printf("Started\n"); std::string
订阅 glu