noisy appearance in the corners of room

[effacer]

Hi all,

I am currently rendering an interior scene for a client (with no windows as its a concept for a conference room) but I am getting noises at the corner of the rooms, in the ceiling where there is intersection of vray light and the mesh (room wall). The noises are clearer as it gets far away. As its a big (closed) room, the noises are very much clear at the other end of the room's ceiling which is pretty much destroying the beauty. I have tried to mess with every little settings of the render control panel but to no avail. Can anyone direct me to the right direction, give me a hint on what to do or atleast tell me where I went wrong?? any help would be appreaciated.

Light used --> vray (plane) light, on the ceiling facing downwards - 2 sided, invisible, sampling subdivision = 64. If i use vray light (mesh), then there are shades created at all the corners of the room. I have tried using both sharp and chamfered edges for the corners. I am working with 3DsMax 2011, v ray 2.0, I7, 12 GB RAM.

[branskyj]

I am not sure but I don't think what you get in the corners is noise. At least it does not look like noise to me. Could it be just shadow from the downward facing vray light? Also in the vray settings Indirect Illumination(GI) is your ambient occlusion ON? If yes- turn it off because that is exactly what it does, it adds darkness where polygons meet.

And finally- post your VRay settings.

Good luck.

[effacer]

i can't actually say its a noise, but it's got a noisy appearance - am talking about the 1st image (vray light of 'plane' type). Of another 'mesh' typed light, yes its kind of a shades as you say, branskyj, which in this case, covers the whole room (picture attached). answer for another question, is no. AO is off, as you can see in the attached pic. so, any suggestion as to what to do??!! thanx in advance. [ATTACH=CONFIG]44046[/ATTACH][ATTACH=CONFIG]44047[/ATTACH]

[AubreyM]

What you could try...

Instead of one big light use 2 or 3 vray planes so the light has a chance to bounce around.

Go into light settings under the Vray System tab and increase the diffuse subdivisions.

[branskyj]

Using Vray light (mesh) with such dimensions is not something I would do or have seen at all to be honest. I mean- the size of the mesh is almost the same as the size of the room and their boundaries almost intersect.

I would follow AubreyM's advise- create several lights (Vray or Standard) in the room and get rid of the VRAy light (mesh). Unless you are trying to achieve something else of course.

 

Good luck man.

[Guest ronalle]

have you enable ambient occlusion in the GI tab of the render settings dialog?if yes...turn it off.might be that.....

[effacer]

@ AubreyM & branskyj : with Vray subdivision, do you mean sampling subdivisions? its value is '64', if u meant that one (image attached too-lightdetail.jpg)

i did try putting multiple vray light (planes) but there was another problem. if i put multiple lights, then the lights leak from the point they touch. Attached is the image, as image can define this better than i can say (multiplePlanes.jpg). Again, there is "THAT" black line or noise-thingy that's been bugging me. So bottom line, NO. putting two vray lights (plane) comes with another issue, using just one of them gives me the same issue AND using vray light (mesh) gives me shades/shadows in the corner. And yes, i want the effect created by the vray light -planes not -mesh, but using vray light- planes is giving me headaches.

Also, i used vray light -planes and vray lights -mesh in seperate files. i mean, they arent put in the same file. i just used them seperately to know what result it might give me.

About the intersection, i did try using the light of smaller size than that of the room, but it again leaves dark areas (like in the image below - smalllight.jpg)

@ ronalle : no man, AO in GI tab is off, as you can see in my vray settings (img attached in previous post)[ATTACH=CONFIG]44079[/ATTACH][ATTACH=CONFIG]44080[/ATTACH][ATTACH=CONFIG]44081[/ATTACH]

[Guest ronalle]

ahh...ok,did not see that,...anyway..the method you are using might always bring problems.... you can try using the ceiling lights to light the space (like in reality),use vray ies light with an ies distribution file (light manufacturers have those,search google)..play with color mapping burn value and bright multiplier combined with the vray-physical camera to balance light and dark.... use reinhard color mapping method.you can also place a vray-plane behind the camera to throw in some light (disable affect reflections,specular and cast-shadows).hope this helps.....

[AubreyM]

Like Ronalle said, Lights should not intersect geometry. That's just asking for trouble.

Lights don't always have to be pointed straight down either. Vray can handle standard and photometric lights as well so you are not limited in your options.

In a nutshell the original problem you had was because of your light placement. No render settings are going to change that.

 

You have an empty room that renders real quick. Just play around with different lights and angles until you get an effect that you like. There are lots of good tutorials on interior lighting around, they will be a big help.

Ronalle's suggestion about the light behind the camera is a good place to start, though I would stick to a standard camera for now.

 

Good Luck!

[aristocratic3d]

And off course finally if you fail to solve the issue. merge all the files in a new scene and then work on render set up again.

[aristocratic3d]

But I am 99.99% confident that its a light placement issue. just make sure light does not intersect geometry.