The concept of size

Question

Hello.

I have a few questions about size.

1. When I read an image with a bitmap, it becomes a square or approximate pixel size, and it is impossible to maintain the size ratio with the original image at all?
2. Is it correct to recognize that if I enter the size of the original image in Physical Size, it will look square during substance work, but the size will completely return to its original size after output?
3. Enter the physical size and open the exported image in photoshop, and the appearance will be the same as Substance Designer, but the canvas size will be a square according to the long side. Why is this? The Windows Photo Viewer is also rectangular in thumbnails, as is PhysicalSize, but when you actually open it, it is stretched to a square.

I want to create a cloth texture from a single cloth photo. The first image I loaded was rectangular, but the size has changed to square. For the time being, the appearance is not right, but I clipped it with MultiCrop and made a natural 1 repeat with Smart Auto Tile. I entered the size of the last 1 repeat in physical size and exported it. I thought I'd fix it a bit and when I opened it in Photoshop, the canvas size was different and I was confused.

Please lend everyone's wisdom.

davescm · Answer

Hi,Physical size is for use when a material is used in other applications that can use this metadata to place the material on an object of known physical size correctly. For example a 4K pixel square could represent 1 metre x 1 metre in the real world or 2cm x 2cm in the real world. Hence the ability to add a physical size. There is a good example of a set up designed to work with non square images that are in a square format,in the templates (File New Substance Graphs > Parametric filters template. It calculates the transform needed to make the image square then correct it back again before output. You could adapt this if you need to work non square. Dave If you are making tileable materials, then making them square is fairly standard practice.  3D Designer will handle non square tiles but in the limitation of mutiples of 16 on each side (e.g. 16, 32, 64, 128, 256 ...etc)

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