edge around opacity mapped planes

V-Ray for 3ds Max V-Ray for 3ds Max :: General
1

I’m using quadpatches with trees on them, the alpha channel being used in the refract slot, IOR set to 1.

The result is this:

Any tips for removing the awful looking egde around the plants - particularly noticable on the horse chestnut on the right.

2

This effect has to do with multiplication of the alpha channel with rgb information. Try checking/unchecking premultiply. If that fails, drop your textures into photoshop, and place them (ctr-click the alpha channel first) onto a transparent background, and save them out as png. PNG files seldome show any of these types of issues.

3

Thanks Christian - I’ll give it a go.