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OPENGL QUESTIONS

how to retrieve z depth and color of a rendered pixel
how to retrieve z depth and color of a rendered pixel
Does that help I would like to retrieve the z height of each pixels of a rendered object in a scene. I will need to retrieve the color rendered too. , glReadPixels and CPU side code
TAG : opengl
Date : November 19 2020, 04:01 AM , By : user2184791
GLSL complex error: implict cast from vec4 to vec3
GLSL complex error: implict cast from vec4 to vec3
wish help you to fix your issue The problem is that you're using vec3 as third argument into mix(). Which is not correct, as it can be only same type as other arguments' type: vec4() or use primitive type.
TAG : opengl
Date : November 10 2020, 04:01 AM , By : Liu Mark
Will any of the following texture lookups cause undefined behavior, non-uniform flow, or both?
Will any of the following texture lookups cause undefined behavior, non-uniform flow, or both?
Does that help I am drawing sprites to the screen using a vertex shader, fragment shader, and a small number of texture atlas (images that contain dozens of smaller sprites). I aim to use a single draw call for the entire scene so need to create a sh
TAG : opengl
Date : November 03 2020, 04:01 AM , By : Malcolm Warden
OpenGL How to calculate worldspace coordinates from frustum aligned vectors?
OpenGL How to calculate worldspace coordinates from frustum aligned vectors?
I wish did fix the issue. Well, it is not 100% clear what you mean by "frustum space". I'm going to assume that it does refer to normalized device coordinates in OpenGL, where the view frustum is (by default) the axis-aligned cube -1
TAG : opengl
Date : October 30 2020, 05:01 AM , By : Alejandro Varela
raycasting: how to properly apply a projection matrix?
raycasting: how to properly apply a projection matrix?
I hope this helps you . To shoot rays out into the scene, you want to start by putting yourself (mentally) into the world after the projection matrix has been applied. This means that the view frustrum is now a 2x2x1 box - this is known as the canoni
TAG : opengl
Date : October 20 2020, 11:12 AM , By : user3850301
Equiv of glDrawpixels that operates on GPU memory?
Equiv of glDrawpixels that operates on GPU memory?
it should still fix some issue Let's cover all the bases here.First, a direct answer: yes, there is such a function. It's called glDrawPixels. I'm not kidding.
TAG : opengl
Date : October 15 2020, 11:12 AM , By : Patrik
How do you determine when an object is drawn on-screen in OpenGL?
How do you determine when an object is drawn on-screen in OpenGL?
Hope this helps You can use the query objects (specifically those object created using GL_ARB_occlusion_query extension Specification). Those object are used to query how many fragments are rendered using a sequence of OpenGL operations (begin/end, e
TAG : opengl
Date : October 14 2020, 01:07 PM , By : Yuri Marques
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