Reflection from image on window glass?
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Are you taking into account the Index of Refraction? Got a screenshot of your setup?
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Hi,
This is a simple setup of my scen. I still can't find the reason why the image don't appear in the glass material. If I put another sketchup object in fron of the glass, then the object is reflected in the glass! Preciate some help! Thanks!
Index of refraction? Could you explain this?
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@3d-kreativ said:
Hi,
This is a simple setup of my scen. I still can't find the reason why the image don't appear in the glass material. If I put another sketchup object in fron of the glass, then the object is reflected in the glass! Preciate some help! Thanks!
Index of refraction? Could you explain this?
You probably need to made your background image wider - larger. I'm guessing that from the background image isn't reflected in the angle you're looking from.
At the moment you got an image pretty much directly in from of the glass, but when you're standing on the right looking at the glass you'll see what is on the left hand side. -
Perhaps the window is looking to the backside of de landscape component. When you rotate the picture component ?
If had the same problem also, and that was the solution for it
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is that image already exploded.. so vray understand the panorama material?
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@vidy said:
is that image already exploded.. so vray understand the panorama material?
With VfSU 1.48 you don't need to explode materials.
But yes, with older you do. @3D-kreativ what version do you use?
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If your camera is far of right, then the glass reflects what's on the far left - and you will see nothing or very little from what is directly in front centre of the glass.
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Thanks for the help! Finally I can see some reflections from an image in the glass! But to see the image I hade to put it very close to the window and make it very small. I also moved it to the left, then it worked. But it's hard to get a naturally reflection. I guess a window can't reflect as much as a mirror. But I'm a little bit confused about the settings for the reflections. First there is the color, white is full reflections and black none? And the number next to the color, is that like a multipier that increases the reflection, the higher the number is?
The image is just a simple image imported and standing alone in the scene. It's a component also, but is there any thing else that should be done to get a better result?
Thanks! I add an part of the rendered window. It looks a bit pale and boring. Is there any way to change this or is this depending on the viewing angle? And yes it's version 1.48.
I'm curious and eager to learn! Thanks!
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Remember that with fresnel reflection, like real reflections the amount of reflection depend on your angle. Also, if the space behind the glass is dark/black you'll see the reflection easier.
I usually leave Perpendicular to white - nor very near white, like the default. For glass, leave the IOR at 1.55 - which is the correct IOR for glass.
But what I usually change is the Parallel colour - I set that to ~20-30 so that there is always a slight reflection. -
@ThomThom:
Up till reading this thread my understanding of index of refraction was that this is a factor of how light is bent while passing through a relatively dense transparent material and would not necessarily affect reflectance which would have more to do with angle of incidence as you showed in your explanations/ illustration.
Does Index of Refraction play a part in the use of Vray and other renderers? -
@mitcorb said:
Up till reading this thread my understanding of index of refraction was that this is a factor of how light is bent while passing through a relatively dense transparent material and would not necessarily affect reflectance
correct
It's affecting how much reflection you'll see when you are parallel vs perpendicular to the reflective surface.
The illustration was just to indicate that when you're standing on the side of a mirror/glass, the reflected image doesn't reflect what is perpendicular to the mirror/glass.
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