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Im trying to create an exterior shot of a car garage, and to make it photoreal, I would like to add imperfections/edge wear to the building, particularly the edges, as seen in the example below (see edges of garage building, building „frame“ around roll up doors).

enter image description here enter image description here

How would you go about achieving this? I tried a boolean and some color changes using the bevel/geometry nodes but nothing comes close to this. How do I add dispacement on edges only without messing with my textures? Is it perhaps done by sculpting? In this case the building would need a lot of polygons, Like an insane amount? How would you go about creating this effect on a bevelled cube, or go about modelling this garage in general to create this photorealistic look? I am grateful for any advice, as I am just starting out…

PS: Obviously the images are made by a famous CGI Expert that I admire a lot, so for the purpose of practising, im using his renders as inspiration (not trying to copy/steal anything).

Thanks in advance!

GSWarriors
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I think your gut instinct is correct, that this isn't where you'd want to dedicate a bunch of geometry (system resources in the end).

This is a very simple shape with a bevel modifier

enter image description here

And shaded smooth with auto-smooth

enter image description here

And that should give the shader system the faces it needs to interpolate bump/height maps across that edge without a hard break. Then you can stick to modeling simple shapes where you need them. Just add one modifier.

enter image description here

Allen Simpson
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  • Is this even an answer to your question? I think your title is somewhat different from the content of your question. – Allen Simpson Apr 18 '22 at 23:41
  • Thank you! Sorry if my title is misleading, but the answer is getting there! – GSWarriors Apr 19 '22 at 06:40
  • I wonder how this process can be taken a step further: obviously using a bump map for the normals means I cant use the normal map of any textures im using, which I find a bit limiting. In terms of color, in my reference the edge wear is in a darker color, I suppose this would have to happen manually? Also, to make things a bit less even, can I add Vertices along the edges an make it a bit random? Finally, I see you extruded the wall instead of using a boolean like I have, I think that is also a good advice Thank you! :) – GSWarriors Apr 19 '22 at 06:44
  • "using a bump map for the normals means I cant use the normal map of any textures im using", why that? You can use both actually... – moonboots Apr 19 '22 at 07:45
  • @moonboots Ah! How? I always thought mixing normals was not really a viable option in Blender? – GSWarriors Apr 19 '22 at 07:47
  • are you trying to mix height map with normal map? or 2 normal maps? – moonboots Apr 19 '22 at 07:49
  • Im trying to have a seperate bump on the edges of my model, while maintaining the normal of the texture I am applying on the rest of the model. Im not sure what the best way of mixing would be… I guess the factor should somehow tell both normals how to split up: one for the edge and one for the rest of the model…? – GSWarriors Apr 19 '22 at 08:17
  • https://blender.stackexchange.com/questions/254747/create-a-damaged-edge-with-shader-nodes/254798#254798 - a mask like this might be what you need @GSWarriors – Allen Simpson Apr 19 '22 at 13:30
  • Cool! Where would I plug the Ramp into? Would I use a Bump node to mix normals and use this mask in the factor? Or how do I achieve the mixing of two normals? – GSWarriors Apr 19 '22 at 14:38
  • well if you just want to darken, you can use this mask as the factor of a Hue/Saturation node where you lower the value. I'm not sure about mixing normals, maybe just mixrgb the normal output from both nodes. – Allen Simpson Apr 20 '22 at 01:04
  • Ill give it a try and let you know! Thanks for all the help so far! – GSWarriors Apr 20 '22 at 13:20