incorrect cubic texture sampling on iphone

[blackmonster]

Hi all.
I have discovered the strange behaviour of ogre's cubic texture generation.

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OgreFramework::getSingletonPtr()->m_pSceneMgr->setSkyBox(true, "Examples/MorningCubeMap");

When i run that code on iphone Simulator i got the propper skybox:

Screen shot 2011-06-07 at 12.10.53 AM.png

But in case of running on the device the skybox textures seems to be scaled and repeated:

IMG_0550.PNG

I noticed that when was applying image-based ligting effect.
Could anybody please explain me how to fix it?

Regards, Victor

[masterfalcon]

What version of Ogre is this? What device? What OS?

[blackmonster]

Ipod 4G, iOS4.3.3, ogre 1.8, Render == OpenGL ES 2.0

[masterfalcon]

Did you turn on the viewport orientation support by any chance?

[blackmonster]

Yes, the orientation change is supported. But the problem is that cubemap works differently on device and sim in both orientations

[masterfalcon]

Yeah, turn off that option. It is no longer needed in 1.8.

[blackmonster]

You mean to disable the notification observer for orientation changing notifications or something else?

[masterfalcon]

I mean, the option OGRE_CONFIG_ENABLE_VIEWPORT_ORIENTATION in CMake.

[blackmonster]

It is already disabled

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An exception has occurred: OGRE EXCEPTION(9:UnimplementedException): Setting Viewport orientation mode is not supported in setOrientationMode at /Users/heavy/SDK/ogre_last/ogre/OgreMain/src/OgreViewport.cpp (line 226)

[masterfalcon]

ok. can you write up a bug? Maybe with some example code to repro the issue?

[blackmonster]

i have created a project from ogre's template for iphone in xcode.

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OgreFramework::getSingletonPtr()->m_pSceneMgr->setSkyBox(true, "Examples/MorningCubeMap",10000);

and only changed the material for skybox to "Examples/MorningCubeMap"

I changed the render to GLES 2.0 and set up the shader system

Then I run the project on sim and on the device. Got the images posted above

[blackmonster]

I found the strange relation between default mitmap level value and appearence of cubemap. The images i posted above are nothing else than full mipmapped texture streched and scaled to fit the side if a skybox.

When I disabled the mipmapping by

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Ogre::TextureManager::getSingleton().setDefaultNumMipmaps(0);

the skybox began to render correctly on the device too. But disabling the mipmapping could not be the solution in case of great memory overhead
I think that filtering param in material script that manages the mipmapping level seems to be ignored by the script compiller.
I used

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filtering point point none

to set the point filtration and to disable the mipmapping of curernt texture, but got the point-filtered thextures and full mipmap texture. I'm continuing the investigation. Could anybody help me with it?

[masterfalcon]

It's strange. I tried to reproduce this using the CameraTracking sample but was unable to. Maybe it's something specific to the template demo.

[d000hg]

I was trying to find out what OGRE_CONFIG_ENABLE_VIEWPORT_ORIENTATION was for and found this thread. I see it's not needed any more but is it supported or will it be removed completely in future?

What did it do?

[masterfalcon]

It was a stopgap feature to enable orientation changes. The reason being that at the time Apple did not recommend using a view controller for performance reasons, but have since resolved the issue. It's staying in for now in case it's useful on other platforms.