iPhone相机图像上的3D模型。 透明背景？

Question

I'm trying to make an augmented reallity app for iPhone where you can see, over the camera images, 3D models built using OpenGL ES. I've already made the part where I get the images from the camera and a GLView that inherits from UIView where I draw the model. My problem is that when I put the GLView over the camera images, you don't see only the model but a black rect covering all the view. I've tried to colour the background so it becomes transparent but I haven't got it. Do you know which one could be the problem?

Thanks a lot!!

Answer 1

I answer myself. Appart from using glClearColor when you draw the OpenGl View, you need to have in mind to things:

• When you create your CAEAGLayer object, you have to assign its opaque property the value NO .

• When you assign the drawableProperties , you have to choose a color format that admits transparency, for example kEAGLColorFormatRGBA8 .

Hope this will be useful to someone else! Thanks Benjamin Andris for your answer anyway! :)

Answer 2

您是否已将GLView的'opaque'属性设置为NO？