Started by sean72, October 21, 2021, 09:07:04 AM
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Quote from: mattjgerard on December 15, 2021, 05:12:59 AMI've found that when I'm fighting with something like this, its always my lighting that is lacking. So, make sure you have a contrasting HDRI with some rather sharp black to white transitions. The way the HDRI transitions between light and dark really affects the apparent shininess of the object. The sharper the falloff, the shinier the surface.
Quote from: sean72 on October 21, 2021, 09:07:04 AMI have been trying to achieve a relatively flat aluminum but have not found a way to reduce the reflection without exaggerating the roughness to the point where the material doesn't look quite real. I have attached examples and my progress to date. Any suggestions or examples?
Quote from: HaroldL on May 10, 2022, 09:29:34 AMI find it odd that with KeyShot's "scientifically accurate" materials there is still a lot of work that needs to be done to get an accurate representation of a material. I'm not sure what scientifically accurate means in regards to materials especially metal. Maybe it's just a way of having a consistent starting point. I think it creates a lot of frustration when a material doesn't look right for a given environment or scene and then you end up using a material that is not even what you want it to look like.
Quote from: RRIS on May 11, 2022, 03:07:57 AMWell, just like real life, you get most of your material expression from your lighting and environment. I find I can get really good results with careful attention to your studio, in that respect Keyshot is no different from any other render/3d software. Also, keep in mind that professional promo renders are often heavily photoshopped, with added/cleaned up reflections and shadows, boosted contrast and colors. Ask any professional product photographer, and you will get an idea of the work and skill involved in creating spectacular imagery.
Quotewhat scientifically accurate means in regards to materials especially metal
Quote from: Anindo Ghosh on May 11, 2022, 06:31:19 AMQuotewhat scientifically accurate means in regards to materials especially metalAluminium is an interesting metal: That whitish surface effect seen in real-world aluminium samples consists of a layer of Aluminium III Oxide (alumina) 4 to 6 nanometers thick, which forms almost instantly (in picoseconds, according to Wikipedia) when a newly machined aluminium surface is exposed to air. This form of aluminium oxide is an opaque white ceramic material with low specularity. To render it, one might try adding a low opacity label of a material with white diffuse and dark grey specular values over the aluminium. I had expected the "anodized" parameters of the metal to yield some useful result, but at an anodization thickness of 4 to 5 nanometers, there seems to be no visible effect, and beyond that a yellowish tint appears. The white powdery effect doesn't show up. The other such problematic metal to render is titanium: Again, real-world titanium instantly forms an abrasion-resistant, low specularity oxide layer of 1 to 2 nanometers, which 3D rendering engines don't seem to offer a way to simulate. If someone does figure out a way to render that oxide coating realistically, it would be invaluable for some of my work, so please share!. (n.b. I'm using the IUPAC spelling of Aluminium by choice, rather than the Americanized "Aluminum")
Quote from: mattjgerard on May 11, 2022, 08:42:47 AMRRIS that's pretty good for a quick study. i have not dived into the generic shader, I think if I spent the time to learn it, could be pretty powerful at creating a material from scratch just like you did here.