[lightwave] need help with glass reflections

[Ayreon]

well, you could try adding the fast fresnel shader to the glass surface. Also you could just crank up the reflection of the glass surface.

Ayreon

[fig]

keep in mind that the glass needs something to reflect as well, whether that's a global reflection or a reflection map applied to the glass. doesn't look like there's anything in its environment that its reflecting.

chris

[leigh]

As has been suggested, try using the Fast Fresnel shader, or set up your own Fresnel effect using gradients in your transparency and reflection channels :)

Also, make sure you give the glass something to reflect ;)

[garethjax]

Originally posted by Ayreon
well, you could try adding the fast fresnel shader to the glass surface. Also you could just crank up the reflection of the glass surface.

Ayreon


Fast fresnel.... hmm i'd have to try.

As for the reflection, it's already at 100%! I've done another test with a object near the front windshield, and it's reflected.

The question is: why the metal reflects the HDRI image, and the Glass is not ? :blush:

[garethjax]

Originally posted by Leigh
As has been suggested, try using the Fast Fresnel shader, or set up your own Fresnel effect using gradients in your transparency and reflection channels :)

Also, make sure you give the glass something to reflect ;)

I hear goddess Leigh talking to me... An appropriate bowdown
motion is due: :bowdown:

Actually, there is a gradient both in reflection and transparency related to incident light.

Maybe it's wrong, i'm trying to remove it and adding a fast fresnel.

As a side effect, i've discovered that adding BDRF make the glass almost opaque (and not reflective) :surprised

[garethjax]

Whoah, looks like it's getting better!

http://www.garethjax.net/auditt49.jpg


The error was that reflection environment option was set to"ray tracing + backdrop". I've changed it to "ray tracing + spherical map" and i've given it the background image as reflection mapping.

The result is quite better!! :D

The big hammer in the image is very important: feeling threatened the car "decided" to render correctly. :D


And now the question is "why the imageworld plugin is not showing the hdri image ?" :surprised

...Stay tuned... but do not hold breath !

[leigh]

Be careful of using spherical maps for reflections - they are very unrealistic, technically speaking. You'll run into problems if you animate your scene, since the reflections don't move correctly.

The Ray Tracing + Backdrop option is actually generally the best. If you don't like the way it looks from one angle, try moving your camera, or rotating the HDR image you are using as an environent. I would only recommend using the spherical option as an absolute last resort.

About the ImageWorld plugin - try reloading the plugin into Layout. Sometimes you need to do that. You shouldn't have any problems with it... What version of LW are you using?

Another thing, I think the reflection on the car body is too high. It's making the car look very CG - you should try lessening it quite a bit :)

[Whylee]

Originally posted by garethjax
As for the reflection, it's already at 100%! I've done another test with a object near the front windshield, and it's reflected.


Keep in mind you can set all values in LW to higher then 100%... 500%... 1000%...

[garethjax]

Originally posted by Leigh
Be careful of using spherical maps for reflections - they are very unrealistic, technically speaking. You'll run into problems if you animate your scene, since the reflections don't move correctly.

Another thing, I think the reflection on the car body is too high. It's making the car look very CG - you should try lessening it quite a bit :)

The problem was that the hdr image was very dark, and wrongly rotated, so the materials were reflecting... a neary pitch black area.

test render 71: 768x756 (http://www.garethjax.net/auditt71.jpg)

I hope it's better than before.

Antialiasing is low, there is no radiosity (only a single distant light)...but... there are reflections at last!! :buttrock:


As usual, critics are not only welcome but rewarded too! (yes, you can boost your karma and book a place in paradise if you give good hints. )

Yes, i'm speaking with you too generic lurker of cgtalk! Quit being a lurker, and write something! Be a non-lurker today! now! :)

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