@Tom Kam I hope you don't mind me pinning your comment - sadly I couldn't pin your comment directly because its in the 'reply' section. @Tom Kam Great tut! I believe this iridescence is caused by a UV protection coating applied to the plastic (plastic will not filter UV light). When you see headlight lenses that have gone cloudy, it's the coating that has degraded, not the plastic. If you sand the headlight lens down to a very fine 2000 grit, then polish with a compound, the headlight will look new again, but you'll need to re-apply the UV coating. Since the coating is added to filter light, it makes sense that it would also create artifacts: eyeglasses with Anti-reflection coatings have a weird green artifact to them, for example. I'm betting the un-coated lens would not have the iridescence. I also don't think it could be internal stresses: the headlight covers are plastic, not glass. Glass might behave this way because after being molten it cools hard, whereas the plastic has a much lower melting point and even when cool, retains some flexibility. The plastic bonds of plastic don't form a rigid lattice the way glass does. Check out Smarter Every Day on YT and look for the vid on the physics of the Prince Rupert's Drop. Cheers!
It is because the head light cover is plastic to save weigth. It is the called birefringence and what you can see the are the stress lines in the material.
If I'm not mistaken that type of "rainbowy" glass is used on most cars nowadays (the good ones, of course), it's not even glass, it's a acrylic type of plastic, that rainbow effect is from the UV light protection layer that is infused into the plastic itself, it reacts like that to light. Basically it makes the plastic not go all foggy after years being used like it happens with other cars (because those that go foggy it's polycarbonate that does not have uv light filter/protection, making it a cheaper material than acrylic).
Thanks for those tutorials really underrated, I am still having some problems with creating realising environment so a revamped tutorial from u would be helpful
nice one, but i think this effect changes on camera view, so you might want to plug the noise texture into the camera/reflection slot of the texture coordinate node
Interesting you mention! I actually think the rainbow is static, because its really somehow in the glass. But ill check the next time I got my real polarizer with me!
Wouldn't you be able to achieve the same thing using the base color slot of the principled BSDF and setting transmission to 1? But anyways pretty useful!
Hey Damian! thank you for sharing this tutorial it really add some points to the realism, i tried applying this into my project but for some reason its not transparent, the rainbow effect is working but its not transparent thus hiding my light source behind this. Any idea why?
@@DamianMathew ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-O1dvvqmx6wk.html Yes..please...make... i found one that on youtube but it is C4D... maybe my teacher can make it much simpler scene...Thanks in advance :)
Rahul Maurya yeah oil has a simular look! A guy in the comments said it might be a visualization of the stress in the glass. So I guess it splits the light slightly different depending on the stress level. Quite interesting. But I still don’t have a full explaining why exactly it occurres. Also why does it mostly occur on super sports cars. I don’t know. I hope I find out soon!
How to use octane for blender?! I’ve downloaded everything needed. I have an NVIDIA 2080 super. Drivers all up to date. I’m running the octane server then try to open up the blender version it gives you and I just get a grey screen and it says “waiting for images” and nothing happens. A lot of others have this issue. Pleaseeee help 🙏🏻 octane is literally 2x faster than cycles and much more realistic lighting
@@nikitos626 didn't solve yet, but for now i just ended up making a simple glass shader without the polarized effect. I don't think Damian will answer us haha.
@@dagimdebrework9318 For CG, 16 GB should handle most projects just fine, with 32+ GB you will hardly ever need more unless you start using your machine for more memory hungry purposes such as video editing, data science, photoscanning, etc.
Those cars that you use, you modeled them or did you bought them online? Just finishing binge watching your videos, amazing stuff. Btw, if you don't mind, could you critique this car model that i've mad a while ago? Thanks! www.artstation.com/artwork/orgXW The car paint was hard for me to work it out, I'm thinking in exporting into blender to try your car paint.
Wheels look really shallow and the lighting is really basic. Try using some official Audi photos to gauge the shape of the wheels and mimic the lighting. It's kinda hard to judge the paint without a close up shot, but from what I can see it's a perfecly acceptable for a regular shot. The windows are transmitting more light than the background has to offer. Make sure that the brake calipers are in the right positions and that the brake disk material is anisotropic. Also, the headlights aren't completely true to the R8. You can get good results with polygonal modeling, but if you want to model cars the right way, Class-A surfacing is the thing to learn, but afaik any parametric modeler with the right tools will cost a pretty penny. Overall, this is a really solid render, dude.
@@HISEROD Thank you for the feedback, I completely agree on the lighting, at that time I cared only about the modelling and kinda ignored the material and lighting. I had tons of problems trying to see the headlight to model, what would you do different? This is the ref I was working with: o.aolcdn.com/images/dims3/GLOB/legacy_thumbnail/800x450/format/jpg/quality/85/www.blogcdn.com/www.autoblog.com/media/2008/05/r8-led-light-cluster-450.jpg
@@cruzefx3652 headlights are really tricky. I would suggest using as many good references as you can find in conjunction with a blueprint. Sometimes I look for videos of things that I'm trying to determine the shape of. The first thing that I noticed was that the DRL's (en.m.wikipedia.org/wiki/Daytime_running_lamp ) were all one clean strip rather than a bunch of individual lights with reflectors behind them.
@@HISEROD Yeah that LED was my hell, couldn't do it individual for some reason, don't really remember why. But thanks man, this week I managed to get the audi model from c4d to blender, so I'll try to redo the rendering, with proper materials and lighting, will def use your feedbacks!
