AA and Alpha -> troubles with geometry edges.....

[MarioRothenbuehler]

hi

check this 2 images....

full version


zoomed in in photoshop


i have troubles with the geometry edges... i see a white border around the
whole geometry.... and depend on background color it looks very strange

i render with transparency... save it in 16bit png with alpha and make the background in photoshop....


and here are the material settings from the ground


scene settings
-AA settings are adaptive subdivisions 1/2
-AA filtes is catmull-rom
-GI enabled
-1 vray light

is this normal or a bug in the AA or alpha engine... ?

/.mario'

[trixian]

That is just your alpha being premultiplied against black in your rendering, and then viewed over white in PS. Go to the menu => Layer => Matting => Remove black matte, and you should be good.

Unless I totally misunderstood what you were asking.

[vlado]

You also seem to have used a sharpening filter for the rendering; try a blurring filter instead.

Best regards,
Vlado

[rivoli]

as trixian said, this has nothing to do with vray. it's rather ps that doesn't know how to deal with premultiplied images. removing black matte can help a wee bit, but for this kind of compositing with ps you're probably better off saving your output in a format which allow you to choose not to premultiply by its alpha.

[Neilg]

Turn your AA filter off entirely, knock up your max subdivisions and sharpen it in post, if you need to. If it doesnt fix it completley, it'll go a long way to helping.

[jacksc02]

you can also go to Layer - matting - defringe

[MarioRothenbuehler]

many thanks trixian and jacksc02 for your help.... it seems that the "remove black color" from the matting menue works.....

/.mario'