physically correct cloth?

Sorel

I render with Octane and while I have found out how to render different materials through it's live database or other research I'm still not sure how/if I am rendering cloth properly. I read that falloff is good for things like cloth but is it more than that? I started a scene here where I have given the coat and pants falloff. Though I feel like it doesn't look realistic, or I'm not entirely sure that's how it supposed to look. Does cloth need some sort of specular/glossy attributes?

j cade

What type of cloth are you going for? I know non-answer answer, but if you compare say silk and denim, they're probably about as similar as denim and hard plastic.

To your specific example, the fabric looks like it may be corduroy or possibly denim. As such I would make the edge blend much less strong. It is generally used to simulate shiny fabrics, like silk and velvet. Whatever the fabric is it looks like it should be much closer to matte.

Generally speaking, the problem with cloth is that it's much more solid than people think. Its one of the few things that has near complex a micro-structure as skin. There's individual strands twirled together into larger strands that are then woven together. Changes in the real world qualities of any one of those elements, and the resulting fabrics will look nothing alike.

Sorel

Kamion99 said:

What type of cloth are you going for? I know non-answer answer, but if you compare say silk and denim, they're probably about as similar as denim and hard plastic.

To your specific example, the fabric looks like it may be corduroy or possibly denim. As such I would make the edge blend much less strong. It is generally used to simulate shiny fabrics, like silk and velvet. Whatever the fabric is it looks like it should be much closer to matte.

Generally speaking, the problem with cloth is that it's much more solid than people think. Its one of the few things that has near complex a micro-structure as skin. There's individual strands twirled together into larger strands that are then woven together. Changes in the real world qualities of any one of those elements, and the resulting fabrics will look nothing alike.

Ah yes I should have specified. I' am looking for setups for matte surfaces, so things like cotton, and denim. Plain things most people wear I guess. I've done silk and the octane DB has velvet shaders already I have just always been unsure if matte surfaces should just stay matte. (or plain diffuse for octane).

mjc1016

Sorel said:

Kamion99 said:

What type of cloth are you going for? I know non-answer answer, but if you compare say silk and denim, they're probably about as similar as denim and hard plastic.

To your specific example, the fabric looks like it may be corduroy or possibly denim. As such I would make the edge blend much less strong. It is generally used to simulate shiny fabrics, like silk and velvet. Whatever the fabric is it looks like it should be much closer to matte.

Generally speaking, the problem with cloth is that it's much more solid than people think. Its one of the few things that has near complex a micro-structure as skin. There's individual strands twirled together into larger strands that are then woven together. Changes in the real world qualities of any one of those elements, and the resulting fabrics will look nothing alike.

Ah yes I should have specified. I' am looking for setups for matte surfaces, so things like cotton, and denim. Plain things most people wear I guess. I've done silk and the octane DB has velvet shaders already I have just always been unsure if matte surfaces should just stay matte. (or plain diffuse for octane).

Cotton is way too broad a category.

I know that this isn't really an answer, but it will help. Go to a fabric store and ask to see some samples of various cotton fabrics...not just 'cotton'..but types of cotton fabric (yes, there's literally hundreds of different types).

The other thing is to think about what type of fabric the item you are trying to render will be made out of. Something like that coat would probably be made from a medium to heavy weight fabric, somewhat on the stiff side...not broadcloth or jersey, but not something fuzzy, like terrycloth (toweling). Denim, duck or canvas...

And, no, there isn't a completely 'matte' fabric...all of them have some, maybe very small, but it's there, specular component.

icprncss

Take pieces of cloth or clothing with the materials you are trying to emulate in the render. Look at them under the same lighting conditions you are rendering in. Note how the light interacts with the fabric. A brand new piece of denim fresh off the production line will not give the same results as a pair of year old, well worn jeans.

Fisty

I render with DS usually so I don't know Octane specifics.. but I always add a touch of specular to fabric, even things that are generally considered matte. It shows off the details and folds better and generally makes the clothing look more 3 dimensional. If it's a generally matte fabric like t-shirt, jeans, etc then I will use a very low and wide/blurred highlight. But your example above looks like cotton corduroy.. I would reduce the specular effect and the velvet/edge blend effect both by about 1/2 and it should look more convincing for that type of fabric.

Sorel

Thank you everyone for the insight. After taking what people have said here and looking at references online I tweaked the materials and came with this. I didn't let this cook all the way but I'm happy with how the coat looks now.

Oso3D

Yeah, that looks like tight wool or heavy cotton rather than plastic/leather from before. Good job!