Grimrock

Juicy.
Thanks, John!

Quickest release bump ever... Have just released 0.4.0.1 which actually draws the axis in the colours that are displayed in the status bar! Just to confirm, Y is up!

nice update! I'll use it a lot tomorrow, headed to bed now

Hey, it's me again. And I have problems! Yay!

Seems like the tangent space updating is still messed up (for me and my models that is). After updating all models with the new tangent space calculation I noticed that the normal maps face in the wrong direction, as can be seen here:
Normally the dots should face outwards, like on the floor tile directly in front of me (the one I outlined with a red line). I imported and calculated tangent space on that one with the Assimp importer. The other floor tiles have the dots facing inwards though.

I can only assume it has something to do with the object export settings I used since from all I can tell it doesn't happen if you calculate tangent space on the original models. Any ideas what might be wrong? It would really be a painful experience if I had to export (and find...) all the 40+ models again, so if there is a chance you could fix it somehow I would be glad. It didn't happen with the old tangent space calculation.

On a side note, I tried to install one of the earlier GMT versions to try the old tangent calculation to have a comparison between the three (old/new/Assimp), but apparently the uninstaller doesn't uninstall the toolkit properly. Whenever I try to install a version below ~3.0 I get an error that says the toolkit is still installed. I uninstalled it using the uninstaller and made sure the 'John Wordsworth' folder is deleted. Guess there is something left in the registry or somewhere else?

I've just noticed that the Assimp Calculate Tangents code is exceptionally documented. I should be able to essentially re-write it in C# in no time. Lets see if that fixes the problem .

Edit: Mind you - I'm sitting at my desk with a runny nose and a headache - so it might not be today!

JohnWordsworth wrote:I've just noticed that the Assimp Calculate Tangents code is exceptionally documented. I should be able to essentially re-write it in C# in no time. Lets see if that fixes the problem .

Edit: Mind you - I'm sitting at my desk with a runny nose and a headache - so it might not be today!

What? Not today? You're fired!

Sounds great (the part about the Assimp code, not the headache), hope you get better soon!

EDIT: Just recalculated tangents on the Assimp imported model and the normal map flipped as well, so it doesn't happen with the object imported models only. But I guess that doesn't matter anymore.

Of course, it's all about managing expectations... I've updated the tangent generation code with an additional 'direction check' that I pinched from the Assimp code. Please let me know how you get on with this for tangent generation: GMT Download Page.

Ah yeah, about going back and installing old versions - I'm using the free version of the Install Shield (LE), so I expect I've not put some settings in there correctly, or Install Shield is leaving some mess in the registry :-s.

JohnWordsworth wrote:Of course, it's all about managing expectations... I've updated the tangent generation code with an additional 'direction check' that I pinched from the Assimp code. Please let me know how you get on with this for tangent generation: GMT Download Page.

Ah yeah, about going back and installing old versions - I'm using the free version of the Install Shield (LE), so I expect I've not put some settings in there correctly, or Install Shield is leaving some mess in the registry :-s.

Hehe, thanks.

Unfortunately it doesn't work. Still flipped normal maps.

EDIT: I could prepare a package with a 'wrong' floor tile, a correct one and the texture I use for testing if that helps.

Sorry, just to be clear - is the 'Calculating Tangents and Bitangents' option flipping the normal map? Or is this a problem with newly imported or old files you are loading back into the GMT? It would be easy for me to add a 'Flip All Normals' button to the editor if that's the only apparent problem?

EDIT: Oh, hang on - I've been an idiot (told you I was ill ). I've not written back the new tangent/bitangent data to the mesh at the end of my new routine. Doh!

JohnWordsworth wrote:Sorry, just to be clear - is the 'Calculating Tangents and Bitangents' option flipping the normal map? Or is this a problem with newly imported or old files you are loading back into the GMT? It would be easy for me to add a 'Flip All Normals' button to the editor if that's the only apparent problem?

It's apparently a problem with the 'calculating tangents and bitangents' option. Object models I imported had correct normals with the old tangent space calculation (apart from not being 100% perfect, but they were facing in the right direction), Assimp models imported using the Assimp tangent calculation option also have correct normals. But when I run the new tangent space calculation of the toolkit on any of them the normal maps get flipped.