OpenSceneGraph Forum

[macher]

Hi,
I have a model in ive format and osgviewer displays it fine. However if i convert it to osg, i get black and white shaded files as textures, which are of no use. I am using osgconv.exe with the following command line

osgconv.exe -e osg -O OutputTextureFiles -O precision:0.001 model.ive model.osg

Is there anything which i am missing ??

Thank you!
Mach

[joctee (Joakim Simonsson)]

On Thu, 06 Aug 2009 10:31:57 +0200, Mach Bhai <> wrote:

Quote:

Hi, I have a model in ive format and osgviewer displays it fine. However if i convert it to osg, i get black and white shaded files as textures, which are of no use. I am using osgconv.exe with the following command line osgconv.exe -e osg -O OutputTextureFiles -O precision:0.001 model.ive model.osg

Try

osgconv.exe -e osg -O "OutputTextureFiles precision 4" model.ive model.osg

precision takes an integer
multiple options are space separated

--
Joakim Simonsson


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[macher]

Thanks but it didnt work. I am still not getting correct textures.

[joctee (Joakim Simonsson)]

On Thu, 06 Aug 2009 14:00:15 +0200, Joakim Simonsson <>
wrote:

Quote:

On Thu, 06 Aug 2009 10:31:57 +0200, Mach Bhai <> wrote: Quote: Hi, I have a model in ive format and osgviewer displays it fine. However if i convert it to osg, i get black and white shaded files as textures, which are of no use. I am using osgconv.exe with the following command line osgconv.exe -e osg -O OutputTextureFiles -O precision:0.001 model.ive model.osg Try osgconv.exe -e osg -O "OutputTextureFiles precision 4" model.ive model.osg precision takes an integer multiple options are space separated

When I try the OutputTextureFiles option, I also get black and white
striped textures.

What image format do you use? I use .rgb.

If you also use .rgb, perhaps it is something with the .rgb plugin...

--
Joakim Simonsson


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[macher]

Yes i am also getting rgb files. It might be that something is wrong with that plugin but i cannot verify. Can we specify the format of the texture ?

[joctee (Joakim Simonsson)]

No, it is not possible.

The current osg implementation looks for the filename extension for the
texture inside the .ive file.
If the texture originally was an .rgb texture, it will try to write it to
that format as well.

On Thu, 06 Aug 2009 14:17:43 +0200, Mach Bhai <> wrote:

Quote:

Yes i am also getting rgb files. It might be that something is wrong with that plugin but i cannot verify. Can we specify the format of the texture ? ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15904#15904

--
Joakim Simonsson


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[macher]

So how can this issue be resolved ?

[joctee (Joakim Simonsson)]

You are using compressed textures in the ive file, right?

I figured out that the rgb plugin can't write compressed textures.

The only pixel formats that are supported are:


GLenum pixelFormat = img.getPixelFormat();

raw.sizeZ =
pixelFormat == GL_COLOR_INDEX? 1 :
pixelFormat == GL_RED? 1 :
pixelFormat == GL_GREEN? 1 :
pixelFormat == GL_BLUE? 1 :
pixelFormat == GL_ALPHA? 1 :
pixelFormat == GL_RGB? 3 :
pixelFormat == GL_BGR ? 3 :
pixelFormat == GL_RGBA? 4 :
pixelFormat == GL_BGRA? 4 :
pixelFormat == GL_LUMINANCE? 1 :
pixelFormat == GL_LUMINANCE_ALPHA ? 2 : 1;

When an compressed pixelformat (0x83f0) is encountered, it is treated as
an unknown pixel format. And hence 1 is used for sizeZ...


On Thu, 06 Aug 2009 14:42:03 +0200, Mach Bhai <> wrote:

Quote:

So how can this issue be resolved ?

The issue can be solved by extending the rgb plugin, so that it can write
compressed textures.

OR

Don't compress your textures when you create the ive file...

--
Joakim Simonsson


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[macher]

I will want to go with the first approach and add support for writing compressed textures.
So how can I go about uncompressing this data ? Any clues ?

and thanks for your help.

[joctee (Joakim Simonsson)]

On Thu, 06 Aug 2009 14:55:12 +0200, Mach Bhai <> wrote:

Quote:

I will want to go with the first approach and add support for writing compressed textures. So how can I go about uncompressing this data ? Any clues ?

You have to write an S3TC uncompressor.

I have done this in a school project some years ago... If you want I can
try to dig up that code.

Quote:

and thanks for your help.

--
Joakim Simonsson


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[macher]

If you can do that, it would be very kind of you.

[joctee (Joakim Simonsson)]

Gotta go now. See what I can do tomorrow.

On Thu, 06 Aug 2009 15:24:40 +0200, Mach Bhai <> wrote:

Quote:

If you can do that, it would be very kind of you.

--
Joakim Simonsson


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[macher]

thanks i am looking forward to your help

[robertosfield]

Hi Mach,

The .dds plugin supports writing compressed textures, so changing the
extension of the images from .rgb to .dds would probably do the trick.

Robert.


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[macher]

Thanks, i only have the ive files, i dont have the original texture files.