what causes those pure white spots to appear in glass dishes? It's even visible in pure white rooms like the pic rel stockphoto
>>7405825*pure dark spotssorry ive been up all night looking at a glass in my room
Magnets
>>7405825Total internal refraction. Here's a blender render with the background set to display the normal direction, so you can see exactly which direction the reflection is coming from. In some areas the geometry of the glass causes the light to get trapped inside until it manages to hit at an oblique enough angle to get out.
with each bounce of light more energy is lost. it's like how the infinite reflections in 2 mirrors facing each other get darker and darker
>>7405871 god this is so cool and helpful, thank youis this difficult to setup? I used blender to check perspective beforeAlso do you know why a glass can have multiple highlights next to each-other when you shine a direct light on it?Pic rel is seen on the cast shadow but you can also spot it on the surface, it's gotta have to do something with the light bouncing around inside it before hitting the eyeball again right?
>>7405871Wtf, an actual helpful post on /ic/?>>7405895It’s really hard to tell without seeing the surroundings, but I suspect it might be camera obscura effect there, making some bright objects outside the building become focused on the table. Or someone just shook the table and its waves in the water bouncing light down unevenly.As for setting up Blender it’s really not that difficult. Hardest part might be making the models if you’re not familiar with the program, but you can get some free ones online. Otherwise it’s just picking Cycles render and setting stuff to glass shader. That being said, by default caustics are filtered, so non geometric lights won’t come through glass. You can disable it by searching “filter glossy” and setting it to 0, but be prepared to wait for days before noise settles.
Possibly the refection of the lamps illuminating the glass.
>>7405939>>7405943its one light source, you can grab a glass right now and shine your phone flashlight on it and see there's multiple highlights right next to eachother caused by just the flashlight
>>7405960Well I can tell it’s the fucking sun, but some of the shapes look kinda structured so maybe it’s some white objects. I’m talking strictly about inside or the circle, and again, it might just as well be wobbly water.
>>7405979its the glass itself
>>7405825bump
>>7405895That's literally explained by the image that guy posted. Light enters. Light refracts. Light exits at multiple points. The glass is a convex but uniform shape so when the light exits it appears to be bands of diffused light. You can see it happening in your image. The light all converges at a single point because the concave glass becomes a lens that focuses it, the light continues past the focused point and you are able to make out the different points at which the light exited.
>>7409882The water in the glass is also contributing to the refraction of the light
>>7405895I think it's something like this. The biggest factor in that image are the water and the convex glass. Light enters from the side. It becomes refracted by the water, bends downwards, the glass shape then begins focusing the scattered light before it exits out the other side and converges on the table. I don't really understand these materials that well since i haven't worked with them a lot, but I think this is how they work.
>>7409882>>7405999but how does a SINGLE light source multiply into multiple reflections? I thought the point of a highlight was that its a plane that reflects the light source perfectly back at the viewer, so how can we get like 8 or so highlights on a surface where those planes are clearly at different angles?
