![]() |
||||||||||||||
|
|
||||||||||||||
|
|
#3 (permalink) |
|
Junior Member
Join Date: Jun 2003
Location: Beirut, Lebanon (+2GMT)
Posts: 14
Name: Majdi Hajjar |
A 100W bulb emits a flux of 1360 lumen (Osram lamp).
This gives a uniform intensity in space of 1360/(4x3.14) = 108 candela. Which is not far from the value given in Lightscape. What is the size of your room? The height? What colors and reflectances are the ceiling, walls and floor? Then I can calculate the lux level on a horizontal plane (illuminance). To see something on the screen, just boost the brightness in the properties menu. This will only change the screen appearance without changing the real values. Hope it helps.
__________________
Majdi Hajjar Lighting Designer |
|
|
|
|
|
#5 (permalink) |
|
Veteran Member
|
This is Ls block that I used as a luminarie, its a 100W lamp. Point, isotropic distribution.
The room is 4x3x2,7 m. Reflectance of materials around 70%. Also I made the cover of the lamp non occlouding, but still the room is black.
__________________
Beeeee! |
|
|
|
|
|
#9 (permalink) |
|
Senior Member
|
Hmm let me guess you are comparing your impression of a 100 watt lightbulb with your brain and eyes right as to what you get with your render ? have you actually considered how much exposure you will need to get a bright room with a camera?
The reason it is dark is because of the tone mapping in LVS. The tone mapping in LVS is set for mean values rather than mapping the perceptually important tones hence LVS does not know which areas ARE IMPORTANT to YOU. It uses a very simple cut off rate of displaying the computed luminance. This is why the file-properties- tone adjustments are there for because only YOu can tell which areas of the scene are important to you.
__________________
_ _ ______________ _ _ Arnold Gallardo Visual Content Creator Technical Writer Author:'3D Lighting: History,Concepts and Techniques' |
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
|
|
|
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| IES light question | graphix | Autodesk VIZ | 15 | July 31st, 2008 06:53 AM |
| light gels/shadow masks - failure | Ernest Burden | Cinema 4D | 7 | September 12th, 2006 06:59 PM |
| vray light hotspot problem! please help | ant_sutton | VRay Render | 4 | August 24th, 2005 12:10 PM |
| How to render indirect light only | Peppi | 3ds Max | 3 | July 12th, 2004 02:33 PM |
| 3dviz volume light beams through glass? | chadsmith | Autodesk VIZ | 2 | January 26th, 2003 07:32 PM |