How do you render primitives as wireframes in OpenGL?
to switch on, to go back to normal. Note that things like texture-mapping and lighting will still be applied to the wireframe lines if they’re enabled, which can look weird.
opengl
How to do ray tracing in modern OpenGL?
I would not advise to try actual ray tracing in OpenGL because you need a lot hacks and tricks for that and, if you ask me, there is not a point in doing this anymore at all. If you want to do ray tracing on GPU, you should go with any GPGPU language, such as … Read more
OpenGL – why is GL_ELEMENT_ARRAY_BUFFER for indices?
GL_ELEMENT_ARRAY_BUFFER is used to indicate the buffer you’re presenting contains the indices of each element in the “other” (GL_ARRAY_BUFFER) buffer. So, as a very basic example with vertices only (no other data), if you have an index buffer: {0, 1, 2} {0, 2, 3} and the data buffer contains: {{0, 0, 0}, {1, 0, 0}, {1, … Read more
What is the difference between FreeGLUT vs GLFW?
FreeGLUT: Based on the GLUT API. GLUT has been around for about as long as OpenGL itself. Many tutorials and examples out there use GLUT. Takes care of implementing the event loop and works through callbacks (good for simple stuff, makes things like precisely timed animation loops and low latency input much harder though). GLFW: … Read more
Using OpenGl with C#? [closed]
Is there free OpenGL support libraries for C#? If so, which one do I use and where do I find sample projects? Does C# provide classes for OpenGL?
How to draw line in OpenGL?
(.25, .25) and (.75,.75) are line’s start and end point. To draw a line from (10,10) to (20,20):
X Error of failed request: BadValue (integer parameter out of range for operation)
I was getting errors like this: On a remote machine, with nvidia graphics card. Solved the problem by installing the NVIDIA driver from .run file, with the option –no-opengl-files (Inspired from here: https://gist.github.com/wangruohui/df039f0dc434d6486f5d4d098aa52d07) Hope this helps!
Drawing Circle with OpenGL
It looks like immediately after you draw the circle, you go into the main glut loop, where you’ve set the Draw() function to draw every time through the loop. So it’s probably drawing the circle, then erasing it immediately and drawing the square. You should probably either make DrawCircle() your glutDisplayFunc(), or call DrawCircle() from Draw().
OpenGL — GL_LINE_LOOP —
A line loop is just an outline. To fill the middle as well, you want to use GL_POLYGON.
Understanding glm::lookAt()
The up vector is basically a vector defining your world’s “upwards” direction. In almost all normal cases, this will be the vector (0, 1, 0) i.e. towards positive Y. eye is the position of the camera’s viewpoint, and center is where you are looking at (a position). If you want to use a direction vector D instead of a center position, you can simply use eye … Read more