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Questions - glreadpixels

glReadPixel return fault result

I want to do the 3D-picking on OpenGl by the way of frame pick. On this way I need to use glReadPixel to get some information of the pixels on the screen currently, so I test it on the following way ...
test-img

ZjuTh

c++

opengl

glfw

glm-math

glreadpixels

Votes: 0

Answers: 1

Latest Answer

OpenGL uses coordinates where the origin (0, 0) is the bottom-left of the window, and +Y is up. You have to convert to OpenGL's coordinate system when reading, since the cursor events use (0, 0) as th...
test-img

Dietrich Epp

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