Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Using Iphone and Objective C
Im trying to find what plane has been clicked/touched in my opengl view. Typically i would use glPushName/ flPopName but this function doesn’t seem to be implemented in the sdk or defined in . Does anyone know where to get there useful functions or another way to get the object that was clicked?
OpenGL ES doesn’t support these functions. You’ll have to find another way to pick. Either:
Render solid faces with distinct colors into a low-res buffer. Select the render buffer resolution so that the pick square occupies a 3×3 pixel grid, choose either the color in the center pixel, or the color that occupies the most edge pixels.
Determine the pick geometrically. This usually entails placing your geometry in a BSP of some sort and doing interesection tests with a ray emanating downwards into the screen, starting from the tapped pixel.
Determine the pick analytically. If you geometry is simple and/or regular enough, you might be able to use some straightforward math to find out what you tapped.