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POHow to get CATransform3D from Projection and ModelView matrices?
 

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  1. POHow to get CATransform3D from Projection and ModelView matrices?
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    <p>all,<br><br> I've got an iphone project that draws a 3D model using OpenGL-ES for a given model view matrix and given projection matrix. I needed to replace 3D model with CALayer, so I put values of model view matrix into CATransform3D structure and assigned it to <code>layer.transform</code>. It worked well, layer was visible and moved on the screen as expected, but after some time I realized that my layers behavior is not precise enough and I should take projection matrix into account. And then a problem appeared: when I simply concatenate two matrices my layer looks odd (it is very small, about 2 pixels, while it is supposed to be about 300, as it is far far away) or is not visible at all. How can I solve it?</p> <p>Here is the piece of code:</p> <pre><code>- (void)adjustImageObjectWithUserInfo:(NSDictionary *)userInfo { NSNumber *objectID = [userInfo objectForKey:kObjectIDKey]; CALayer *layer = [self.imageLayers objectForKey:objectID]; if (!layer) { return; } CATransform3D transform = CATransform3DIdentity; NSArray *modelViewMatrix = [userInfo objectForKey:kModelViewMatrixKey]; // Get raw model view matrix; CGFloat *p = (CGFloat *)&amp;transform; for (int i = 0; i &lt; 16; ++i) { *p = [[modelViewMatrix objectAtIndex:i] floatValue]; ++p; } // Rotate around +z for Pi/2 transform = CATransform3DConcat(transform, CATransform3DMakeRotation(M_PI_2, 0, 0, 1)); // Project with projection matrix transform = CATransform3DConcat(transform, _projectionMatrix); layer.transform = transform; } </code></pre> <p>Any help will be appreciated.</p>
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    1. CODid you ever manage to get this working? I'm trying to do the same thing — convert from OpenGL projection and modelView into a `CATransform3D` to be attached to a `CATransformLayer`.
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