Why do i get this on renders

[bpzen]

Hi Paul,

I seem to get this allot if I do not use bright lights, when ever i want to create a shadowy or night time in door image i get this awful looking blotchy crap on the skin , left upper arm for example.

I have 4 lights

2 are the light bulbs set to diffuse using IES on the night stand table lamps, they are not providing much light at all at all

I have one mesh light on her right side, look in mirror skin looks clear and crisp
I have one mesh point light on the ceiling using IES (adj distribution node etc... to point at her) to limit the crazy amount of light i would get if not.

I am 3.6k passes into this and it looking really bad with the clarity

Hotpixl 0 Caustic is at 1 filter is at 1.5 indirect lighting i set in both directions with out any change....

why dose her face and left side look like crap, i can put a bright light on her and its clear but i don't want the room looking like a nucular fusion plant , i want dark shadowy low lite setting

Aperture setting is at .5 tahts why mirror is blurred a bit, focus is on her lips, he rface look s unclear too...
Version 1.52 plug in

http://erotic3dx.com/misc/test.png

Settings screen shot - would reall ylike to knwo what i am doing wrong, is it IES lights?

http://erotic3dx.com/misc/setting.jpg

[bpzen]

it appears its IES lighting, i use a mesh with out the ies file attached on mian light and things look good, however the room is lit up like a soccer stadium, how the heck do we get low light, shadows to work in octane, other render engines seem to do fine including firefly for moody lights. I seem to be one extreme or the other too bright or no spec reflections due to lights too low.

[face_off]

I cant see the IES light material - so make sure you use a spherical projection with it - http://render.otoy.com/manuals/Poser/?page_id=104.

Skin : Are you using an SSS shader? If so - that will mean more samples and a slower render time.

Her skin looks OK to me, though at 3.6k samples maybe it is still a little noisy.

If the low bulb emitters are just an emitter material put on the bulb geometry - that will probably produce a lot of noise. Is the emitter geometry behind some glass in the lamps? If so, remove the glass. Sample for the ceiling emitter - make sure it is not touching the ceiling.

I find IBL lighting to require no setup, no tweaking, renders very fast, and impossible to get a bad result. Emitters on the other hand require some skill and experimentation to setup and get right. If you are getting noise, use only emitter geometry which is the single polygon plane. Always attach an IES light. Tweaking the Sampling Rate of the emitter material can make a difference. Make sure emitters are not behind a glass object. You can also cheat by illuminating the scene with more light than needed, the tweak the exposure and gamma to get the right light level.

You can also render with each emitter separately to see which one is causing the noise.

There are some great examples of extremely high quality renders done with emitters in these forums - suggest checking them out and picking up hints from the creator as to how it was done.

Paul

[wimvdb]

One thing which I do with light emitters which are small or behind glass (especially in low light conditions) is to add an additional mesh light which is larger and make it either transparent or do a "hide in camera" on it. If the light source itself is to be reflected I keep the emitter on the original at a very low setting. The new mesh light can be much easier controlled and renders much better because the surface is larger. If you use a one sided plane as the replacement mesh light you will have better control over the IES distribution as well.
With regards to IES lights - I found out that each IES map needs its own light power setting. Pretty obvious for a spotlight vs room light but less obvious for others. The map not only controls the angle, but also the falloff for the light. So changing the IES map to a different but similar one may make a big difference

[bpzen]

thanks Paul, ye sIBL is great but it lights up everything, for a night time indoor image they dont seem to work well for me.

For outdoor sure looks great or for a very lit room.

How do people get low lit shadowy renders? IES I suppose? I took the IES off that image and its clear as can be but the room looks like she has soccer stadium lights pointing in it... frustrating.

[bpzen]

thanks wimvdb and Paul, let me delete all these lights and try again, I do believe I need IES to get teh render i am looking for. I have used them in teh past with some succeeds. they seem rather difficult to get right. I am not an expert with other engines but play around with V ray a little, as complicated as that is it seems to get results like this aster and easier. assume this is an Octane thing, I hope they make this easier to deal with someday. Out door or well lit images seem to be excellent these low lit almost spot light type renders are to hard, at least for me.

[bpzen]

Paul on teh sample setting should i move that up form 1 to like 10, 20 .... any suggestions?

[face_off]

on teh sample setting should i move that up form 1 to like 10, 20 .... any suggestions?

I'm not sure what the best setting is - sorry. You will need to experiment with this. IMO the most important thing is to make sure you have a spherical projection assigned to the IES light. Without this, it will not give the right result.

Paul

[bpzen]

I changed the lights based on the manual and the suggestions, the laps are now using Emitters from point lights with IES and opacity = 0

I now have 2 lights im using to light the girl, one Emitter prop made with script) with IES in back above ehr a bit

I also have one in front of her to the left a bit a little above her.

I still see lots of noise that is nto improving much, anyone know how to accomplish this type of lighting and not have awful noise in spots? Seems darker areas are much worse. But I would say her legs still have noise (yes SS skin that looks great in high lit settings).

http://erotic3dx.com/misc/test.png

http://erotic3dx.com/misc/settings.jpg

Very discouraging, been playing with IES settings all day... try and clear this up.

[bpzen]

Paul can you confirm the setting is have for IES are what is recommended e.g. i have Spheracle in teh right pin set?