CoronaTileMap and Real-World scale.

[matsu]

There seems to be something wrong with the Tile Map and Real-World Scale.

I want to use RWS to set both the size of the tiles, and the size of the teture displayed on each tile. I use RWS on all geometry per default.

I set RWS in the Tiles map, and set the tile size to 150x150mm. I plug in a Corona Bitmap in the Tile Color, and set the Bitmap to RWS 150x150mm. You would expect to have one repetition of the bitmap per tile, right? Wrong! I need to set the bitmap to a 1x1mm to make it 150x150 in the render!!

It appears to be some kind of mistranslation of the tiling parameter from the bitmap.


Also, I thought I would bypass the issue by setting the Tile Map to UVW chnl 2 and the Bitmap to chnl 1. That did not work at all - and the bitmap instead used the chnl 2 mapping.

[Tanner]

I personally haven't had an issue with the tile map and RWS, but it depends on what your ultimate end-goal is. I use metres for both my system and display units. If I may a Tile map set to 0.15x0.15m with a 0.005m gap, and then plug a coronabitmap into the tile slot, the texture fills the entire tile. The Cbit is set to RWS as well but defaults to 1x1m (which is the same as 1.0x1.0 if RWS was disabled).

In  the tile map, I also set the Tile Mapping to Per Tile and Text. Placement to Crop (defaults I think). If I set the tile to 0.15x0.3 and then deviate the Cbitmap to 0.15x0.15, then yes, we get the dense repetition.  But if your tile is driving your texture size, why set it in the Cbitmap as well?  If you set the Tile mapping to original, then you will have the UV mapping of the bitmap within the tiles, as if the coronatilemap was a black and white mask multiplied on your texture (black being grout, white being tile).

If you could elaborate why you need both the tile to match the coronabitmap, I may be able to help further.  But leave the bitmap as 1x1 and you should be golden.

[maru]

Something fishy is going on here indeed. I have reported it as (Report ID=CMAX-1525).
The workaround for now is to use 1x1unit scaling in the input texture, or disabling the RWS option in it.

[Tanner]

FWIW I feel like that is the intended use of the ctile map. More often than not I would plug triplanar maps into the various slots for the ctile and use that to help drive texture size (with the cbitmaps plugged into that or into a mappingrand node then into triplanar remaining as RWS disabled, scale: 1x1).  If I need the texture to be a specific size, I would rely on the ctile dimensions, in this case 15x15cm.

I'm curious as to what I'm missing. Maybe if a texture had to be 20x20cm but the tile was a different size or various sizes, but even then I'm confused about the end goal and why 1x1 not-RWS is not acceptable if the tile itself is 15x15cm..