I can easily import transparent PNGs into Rhino (v6). It is great for the front face of buildings. But in rhino, the upper edge has a faint pixel line. You can see it in rhino itself and in my render program (simlab composer) I checked it in photoshop an affinity photo, it is 100% transparent on the edges.
but for the sake of the future, i would also prefer not to slice it off. @pascal@stevebaer can you confirm that this is a bug, or what is happening here. i tried png with all sorts of settings, non yield an image without boarder, all pngs where clean at the edges.
@bodzguard thank you for the image. I indeed can see the line with this image - I haven’t figuret yet out why. It does look like a mapping problem as @Gijs suggests. The weird thing is that I even see it even with Raytraced.
isn’t this the default behavior with tiled textures - bi-linear interpolation works on ‘centers’ of pixels - so what in the grid view is a pixel, once interpolated becomes the center of a bi-linear interpolation?
I saw this long ago in rhino, and wanted to report it, but after closer inspection i realized that it is inherent to how textures are drawn.
Still it would be nice to have a ‘repeat’, ‘clamp’ and mirror option in textures uv (respecting transparency)
in other words - i noticed this when trying to solve a problem with ‘pixel perfect’ textures, just to realize that the pixel that had a left top corner of 0,0 in opengl (and any similar context) was suddenly at 0.5 / 0.5 and would always have to take the missing information part from the ‘other end’ when set to repeat, which is the default
That is strange, I see the same with that file. BUT when I tested with a simple PNG from the net and I do not see any artifacts along any edges. Neither when used as a picture object nor if added as a material with or without repetitions.