nvpro-samples / nvtt_samples Goto Github PK

I wanted to modify the game Witcher 3, and faced with the fact that some textures dds format does not open. Perhaps the implementation of the image itself is proprietary, and to you should not be a claim. But at least the program should report that it does not support this type of images. And not a stupid pop up. (When you try to open goes noise on the speakers).

There are textures in the link:
Texture 'alnus.dds' (Diffuse) opens without problems (NVTT is probably the only software that opens it)

Texture 'alnus_n.dds' (Normal Map) and 'alnus_s.dds' (Specular) do not open, the program crashes when trying to open them. Maybe it has something to do with sRGB modes ? It is possible that another program that pulls textures from the game, breaks the texture.

https://drive.google.com/drive/folders/1Esy2ZBMjccM790nux28qR2l5eomjL9g7?usp=sharing

In file nvtt_samples/compress/compress.cpp std::path is used wrongly

See line 410
output = input.replace_extension("dds");

replace_extension modifies the @input and as a result the program doesn't work with non-explicit output file:

Replacing the line with:
output = input;
output.replace_extension("dds");

fixes the issue

I used the compress code to compress a png file. After I got the dds file I put it into photoshop which has got plugin nvidia-texture-tools-exporter and found that some alpha channels were wrong.

This is the original png file. It is round-bordered.

This is the dds image, which I have transferred to png format with photoshop.

the arguments are
-astc_ldr_6x6 3011000_best.png

It looks like that every 6 by 6 block share the same alpha channel.