Question

I have an EAGLView displaying an OpenGL 3D model, and a UIImageView displaying an image.

What I want is to display EAGLView above that UIImageView with transparent background.

Is there any way to display this 3D model with transparent background, on top of the UIImageView.

Any solution would be appreciated.

Answer 1

Here is the solution I found:

In EAGLView.m initialization

self.opaque = NO;
self.backgroundColor = [UIColor clearColor];

CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
eaglLayer.opaque = NO;

CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
const CGFloat myColor[] = {0.0, 0.0, 0.0, 0.0};
eaglLayer.backgroundColor = CGColorCreate(rgb, myColor);
CGColorSpaceRelease(rgb);