Ideally for both 7" (Single) and 12" (LP) types.

I thought about scanning the damn things but that gives somewhat unsatisfactory results, even with the cleanest scanner glass and a near as dammit pristine record. Different colour vinyl doesn't seem to help, either.

The best I came up with so far is a series of thin, narrowly spaced concentric circles but the detail geek in me ain't satisfied with this.

Even a rudimentary spiral is a major pain in the rear end, it seems, so if anyone found a way to do it without causing endless pain, suffering, outbreaks of bad language and whatnot will have my gratitude.

I assume that you will be creating a bump mappings for the vinyl discs? Considering how many circles it will take to create a decent disc, you may need to consider an image. If you have photoshop or GIMP, there may be a template available you can work with.

how about using a high rez tiff file for bump instead of modeling in all that detail?

Have you considered applying a free hi-res image to a plain disk ?? Use grey-scaled image as a bump/displacement map ??

I reckon many CAD packages could craft a disk with actual groove, per 'turning thread on a bolt', but result would be very, very high-poly, akin to a complex terrain model...

How close do you intend to get to the vinyl to render? You may get away with a spec map that suggests the grooves instead of trying to create a bump map.

If you can tolerate concentric, there's a record in my Broadcasting set with a fairly fine set of concentric circles plus spiral leadin and leadout. It's a bump map.

https://sharecg.com/v/88375/gallery/11/Poser/KDV-a-1930s-radio-station

You have permission to use the record or the map.

Thanks, all.

I really haven't considered modelling the detail in. Oh, not ever. I'm not daft, yer know. I've always wanted it to be a texture file and so far, I've been using a high res PNG, which is OK but I'd love something a bit more... spiraly.

@ockham: Many thanks. I'll take a look at it and may borrow some of it for my own use. If I ever release anything (doubtful, at least in the immediate future) I'll make sure you get the credit.

Don't worry, I owe you some 'value' after using your Daleks often!

adp001 posted at 7:00AM Fri, 11 September 2020 - #4399176

Would that work in Firefly? I don't use Superfly.

It won't work in Firefly, Sam. It's a cycles material.

Well, that's a bit of an embuggerance. :(

It's the same as this for Firefly. I didn't faff with the spec or bump settings or even render it to see but it's essentially the same mat...

Cheers, mate! I'll give it a go.

It works. But different.

This may be a start to experiment. And set the bump intensity mutch lower. For me it is 0.02.

Anisotropic depends hardly on light. And needs high render values.

Oh yes. The bump value in my screen shot is absurdly high. Funny because my go to default value for bump testing is 0.02 as you show (inches)

Also yes. Anisotropic is a very strong specular, probably why so many in the past have used it for specular on transparent materials like cornea and such.

Anyway...

About anisotropic lighting in renders:

https://www.opengl.org/archives/resources/code/samples/sig99/advanced99/notes/node154.html

It's something I have in the works, but I expected to have to get into before long. I planned to go with either a normal map or bump myself.