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Forum Index - Lighting - mr sun problem i think

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-JackTheFunk
Member
JackTheFunk

8 months ago
Ok i dont know if anyone on this forum is experienced with MR or even if this is an mr problem, but it most likely it is. I have a MR sun and sky system with a mr sky portal to light an indoor scene with some sunlight shining through the window. When i add a plane for the window pane and assign a glass material to it the the lighting looks good but i think the MR sun shining through it makes it bright white and i want to be able to see through it to see out of the window. Is there way to make an object invisible to the mr suns rays so that i can once again see through my window?

I'll post some pics to show you shortly.


-johnbeyer
Member
johnbeyer

8 months ago
Some pictures would be nice, yes smile.gif In Vray, you can exclude any object you want and you can choose to exclude the shadows, illumination, or both, I am not sure if this is possible on some with with MR, but I believe it would be.

-JackTheFunk
Member
JackTheFunk

8 months ago


First image is without any window pane geometry. Nice background can be seen as expected. Second image is when i use a plane with a reflective and refractive material (raytrace to work with mr lighting). I want to have windows with some reflection of the room, but also to be able to see through to the background outside, but instead i get monumental glare. Any ideas?

-johnbeyer
Member
johnbeyer

8 months ago
Hmmm..I am not sure how to solve that , My knowlegde of raytrace and Mr lighting is not enough , but I am sure others can help you out.

-JackTheFunk
Member
JackTheFunk

8 months ago
hopefully. i'm continuing to model things for this scene in the meantime, finishing up the ceiling lights, making some blinds then i'll hit up some textures, cant wait for it to come together.

-johnbeyer
Member
johnbeyer

8 months ago
I've commented on your portfolio wink.gif Maybe you've missed it.,

-JackTheFunk
Member
JackTheFunk

8 months ago
Cheers man. Appreciated, although that image had no glossy reflections tongue.gif.

Got a bunch of textures sorted, its looking reet good now. Nearly done now, just ironing out a few issues. my rug is throwing up problems in the floors reflections.

Rendering now, its taking 40 minutes a pop now. Will upload a pic before bed.

-fredriku
Junior Member
fredriku

8 months ago
I have experienced the same problem with mental ray. Hard time to remember what the fix was. If your windows are plain boxes (they should be boxes anyhow, not planes) with only one face / side you could try to make a box maybe 9x9x9 or something. I _think_ that solved one simililar problem I had. Dunno the reason why it happened *shrug*

Otherwise you might try adding another geometry with the same material somewhere else in the scene "off cam" that has also solved relect/refract-issues for me with mental ray in the past. Again I have no clue on why smile.gif

Hope this helps.

-Tyson
Senior Member
Tyson

7 months ago
I'd just render a separate pass for the windows, you get more control that way.

-JackTheFunk
Member
JackTheFunk

7 months ago
lol i dont know how to render separate passes for thing, but i'll dig up some info and have a bash maybe.

-Tyson
Senior Member
Tyson

7 months ago
smile.gif yeah, I highly recommend getting into the process of compositing, it pretty much changes the way you think about every problem.

In this case I would try doing the following.

select all the objects in the room(except the window glass)>right click>object properties>uncheck visible to camera.
now with a transparent reflective material on the glass object you should get a render of just the glass
but with the room in its reflection. which you can save as a 32 bit .tga.

The other thing is that you will probably want to mask off the glass with the window frame and any geometry that comes infront of the window.
to do that in scanline the way that comes to mind would be to apply a black material to everything but the glass
and a white self illuminated material to the glass then turn off all the lights and render.

so now you will have one pass with just the glass with some reflections and an alpha channel.
and one pass that is just a white square where the glass fits with the rest black.
in photoshop put the black and white pass ontop of the glass pass and set the blending mode to multiply.
then flatten the image and copy paste the new image onto your room render with no glass in the windows.
set the blending mode to lighten or screen and adjust the opacity till it looks right.

Hope that made sense, heres a screen grab of my quick glass material in scanline. good luck. the image is looking good.


+Spiegel
Junior Member
Spiegel

6 months ago
This aint a solution, just a stupid question.....is the rug flying!? Cause its shadow tells me it's flying!! >.<
No Gods but Yourself!! >.<

+Steve Martin
Moderator
Steve Martin

6 months ago
now that you mention it...
[Link to www.3dprevis.com]

-JackTheFunk
Member
JackTheFunk

6 months ago
oops, it'll be the displacement map on it, should've noticed that. When i go back to this render i'll have a looksee.

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