imperfections on edges

Corona Corona for Cinema 4D Help Required
1

hi to everone, and happy new year!

i don’t know if there is already a topic for this…
i want to add some imperfections to edges of an object for a close-up render. for example a concrete wall, where the cement is missing in some places (broken off)

see attached image.

  1. i tried to solve it with a texture in the bump slot of round edges

    didn’t work very well / it wasn’t satisfying enough, as far iim searching for a realistic look.

  2. i tried to solve it with a displacement map and beveled edges.

    the problem here is…the height of the displacement is the same on both, surface and beveled edge.
    would be nice if there is a way to handle displacement separately. one slot for surface, one for edges ;o)

back to my request…
is there any way to accomplish this?

i thank you for your help and inputs.

stock-photo-piled-concrete-curbstones-construction-material-for-road-construction-works-1567411117.jpg
stock-photo-piled-concrete-curbstones-construction-material-for-road-construction-works-1567411117.jpg1402×1116 456 KB

2

You can always bevel your edges and instantly get faces to apply displacement to.

3

Hmmm.. There should be a way to mask displacement using the AO filter set to ‘outside’… however I can’t get it to work… tried a few things but if I get anywhere I’ll let you know.

4

The AO shader is currently not allowed in the Displacement channel. There should even be a warning about that.

5

thanks for your answers so far.

@houska:
this methode is very time-consuming. i’m looking for a “global” solution by edge shader.

@rojharris:
okay, thanks for the hint.

@houska:
basically i’m doing architectural renderings (interior & exterior) > adding imperfections to edges would be a “killer”-feature in corona! :oD
would be on my wishlist for future releases :o) but i don’t know if this will ever be possible…!?

so…how would you personally add imperfections to edges at the moment?

6

I had a quick play around and came up with this. Feel free to tweak it how you see fit. :smiley:

Chipped Edges.jpg
Chipped Edges.jpg1920×1080 288 KB

Chipped edges.c4d (330 KB)
Chipped Edges.jpg
Chipped Edges.jpg1920×1080 288 KB

7

thx @beanzvision
i tried to tweak it. but as i tried on another object (for example 200x100x10cm) the shader is messed up (stretched).
i ended up by manually deforming the edges. it took too loooong… :o(

would be nice if there’s an easier way to get such results in future.
i like the round edges feature and always use it. not only bump should work with it, but displacement, too ;o)

Imperfections_edges.jpg
Imperfections_edges.jpg595×971 203 KB