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Dear all
Need advice please
I attached a render I did recently
My question is what is wrong with the light, I feel that the model still not illuminated right it is still dark.
In the other hand you can see I have a lot of light sources in the model.
What can I do with the dark area? Should I need to put emitter every place?
For general light I use HDR file, maybe I need to use sky dome?
My friends please light my way
Thanks

Hi Dubir,

I think a skydome would do the job. At least you'll have the possibility to tune the overall illumination easily. Please note, If you scaled up the lightsources you'll need to adjust their intensity as well because the default intensity is scale dependent. There is a chapter in the handbook explaining this.

BTW you have a nice booth here ... What is it about?

Regards.

dubir wrote:Dear all
Need advice please
I attached a render I did recently
My question is what is wrong with the light, I feel that the model still not illuminated right it is still dark.
In the other hand you can see I have a lot of light sources in the model.
What can I do with the dark area? Should I need to put emitter every place?
For general light I use HDR file, maybe I need to use sky dome?
My friends please light my way
Thanks

It's a bit tricky to see what's going on in that fairly small image. I guess you've got an HDR in the illumination slot but the background and reflection slots are turned off and set to None? I'm not sure how you seem to be getting a very sudden blurred edge on your background. If your scene is to scale, I wouldn't think that would be DOF but if it's not DOF then I'm not sure why the HDR wouldn't be lighting the area beyond that zone. Can you clarify what's going on there?

Also what areas do you feel are too dark? Most of it seems pretty well lit. Are you just talking about the areas towards the top of the image on the underside of that covering?

-Brodie

I think the lighting is great in that image! What are you not satisfied with? Or what is the look you were going for? Can you post any samples?

Hello to everyone!

I have imported from sketch up a simple model (in meters) of a cube(1x1x1m)
with a little sphere on top of it at a distance of 10m.

For the emitter I am using an IES file (eg. ERCO_Stella 1xHIT-CE_150W).
when I render the scene, I do not see anything, everything is dark and the
blue cones coming down the emitter are small and do not even touch
the cube or the floor surface.

Is it there a way to scale the IES file in order to reach the appropriate
ligth condition I would need?

How can I use a IES light, let say in a room with a ceiling height of 10
meters and get enough light at floor plane?

(someone told me to scale down my model leaving the IES file as it or to use
somekind of IES editor which you download from the web is but I
would like to know if there is another better way to do that)

What should I do?

Please let me know,
Thank you so much!!
G

The blue dots don't tell you much other than the direction the light is pointing. They don't represent the extent the light will travel or anything like that so don't worry if they don't reach the floor. IES lights are created from real light data so if you want a realistic look you don't want to muck with them or the scale of your model (I suspect that advice came from someone who is used to biased renderers like Vray where you're much more likely to cheat with things like that).

If your light isn't bright enough, then your camera settings are probably wrong. As for your image below you've got an ISO of 285 and a shutter speed of 1/8 which comes to an EV of 7.5ish which is within the range I'd expect.

You've yet to tell us what exactly you're unhappy with regarding your original image though.

-Brodie

A couple issues that are going on here I think...I'm pretty sure it's due to the scene setup rather than any lighting issues.

First of all, with your model just sitting in a blank open studio, once a light hits a surface, it's pretty much going to just bounce off into space. In a real world environment, there would be things around it for light to bounce off of and contain the light, if that makes sense. I think that's the biggest thing causing it to look dark. Maybe try putting it inside of a white cube, with the cube set to invisible from the camera. That'll give the lighting something to bounce off of and back onto your object.

Also, the black background, it going to automatically make your object more dark. This may not be able to be changed since it's the look you're going for, but if you're curious, try putting it on a white background in photoshop, adjust the levels slightly to look correct with the white background and i'm sure you'll find the model automatically looks not as dark.

My guess is it's the combination of those two things that are making it look dark. The lack of environment is physically causing it to be darker and the black background is visually making it look darker.