How to use SoTextureCubeMap correctly?

[captain0xff]

Hello, I am trying to create a cubemap through SoTextureCubeMap. I am setting the filenames field with filenames of the 6 images but the cubemap looks distorted.

With SoTextureCubeMap:

With SoTexture2:

It works as expected if I use a SoTexture2 instead of a cubemap. Here is the relevant code:

auto get_cubemap_filenames() {
	const static char *filenames[] = {
		"right.jpg", "left.jpg",
		"top.jpg", "bottom.jpg",
		"front.jpg", "back.jpg"
	};

	return filenames;
}

void add_cube(SoSeparator *root) {
	auto cube_separator = new SoSeparator;
	auto ts = new SoTranslation;
	ts->translation = {2, 0, 0};
	cube_separator->addChild(ts);

	SoInput::addDirectoryFirst("../assets/skybox");

	// SoTexture2 *texture = new SoTexture2;
	// texture->filename = "back.jpg";
	// cube_separator->addChild(texture);

	auto cube_map = new SoTextureCubeMap;
	cube_map->filenames.setValues(0, 6, get_cubemap_filenames());
	cube_separator->addChild(cube_map);

	auto cube = new SoCube;
	cube->width = 1.0f;
	cube->height = 1.0f;
	cube->depth = 1.0f;
	cube_separator->addChild(cube);

	root->addChild(cube_separator);
}

I also tried setting all the imageNex*/imagePos* fields but that also doesn't work.

I am on debian linux and using the latex version of coin from github.

[captain0xff]

@VolkerEnderlein do you have any idea about this?

[VolkerEnderlein]

According to the official OpenInventor documentation see here the order of the images is somewhat different, but that should not matter. They also give an example how to provide the image names (i.e. use set1Value(i, SbString(filename[i]))) To me it looks like the texture coordinates are incorrect and only a quarter of the original image is displayed top down. Can you remove width, height and depth from the cube as the default values (2.0) should suffice?

[captain0xff]

Yes, I too checked that doc and followed the things it mentions but that also gives the same result. Actually, I used the different order for the filenames because the coin docs prescribe a different order (though that shouldn't matter for the library):

Can you remove width, height and depth from the cube as the default values (2.0) should suffice?
Removing those fields also don't help.
Only the cube is bigger now (as expected) but the texture mapping is still not correct.

Do you think this is a bug? Should I create an issue for this?

[captain0xff]

Tried with other image formats like PNG but no improvements

[VolkerEnderlein]

Yes, please file a bug report in the Coin repository.