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Bob_CP

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Reply with quote  #1 
Still testing out how different settings affect renders.

I am using square recessed lights as a light source in an enclosed box. With one small "window".

The first image shows the render with "soft omni" deselected. And you can see both that the light source is square and the harsh lines of light on the adjacent wall.

After selecting "soft omni", the lighting on the wall is very nice, but the light source in the ceiling is now round, eliminating the specified square trim light source.

Any way to get the soft effect on the wall while maintaining the appearance of the square recessed light?

Thanks

Bob

soft omni off.png  soft omni on.png

bigstick

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Reply with quote  #2 
It depends entirely how the light is configured. Did you insert a light from the Browser, or did you make your own?
If you modified a Browser object, did you modify the light output?

In simple terms, the soft omni 'switch' simply triggers a line in the code that makes the edges of the light envelope more blurry.

However, some fittings in the Browser are not configured optimally and have a light source both inside the recessed fitting and below it. It looks like this is how this light might be configured.

Creating light fittings can be a bit fiddly and takes a little while to get the hang of.

You need to use the right light type, and play around with the material of the geometry to get the best results. For example, you often need to take the power down, but make the materials in the fittings very reflective. This gives you the best distribution with the lowest power, and lowest risk of burnout.

For most lights, I would recommend using an LEM, or a spot light not an omni light. They are softer and more predictable.

AN omni light is in effect a spherical light. When the power is set too high, it breaks through surrounding geometry, which could be what is happening here.

Some fittings in the Browser cause problems if the power is increased for all the resons above.


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Bob_CP

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Reply with quote  #3 
Thanks for weighing in, bigstick.

I did create the light "fixture" myself, inserting the omni light into it. Continuing to fiddle with it after posting this question, I found that if I move the light source higher into the fixture recess, I could trigger the soft omni and at the same time keep the square shape of the fixture lens square. I've got the power set, what seems to be, quite low at 1.5.

I'll have to experiment around with the spot and LEM sources as well.

Thanks

Bob
bigstick

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Reply with quote  #4 
When trying to model a light fitting, the best approach to take is to try to simulate how things work in real life.

That means locating your light source in your fitting where you would expect to find the bulb, and not using LEM's as physical materials. No material physically emits light (at least none that I know of) so LEM's simulate light sources - not materials.

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Bob_CP

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Reply with quote  #5 

I experimented with the spot light option and find that I cannot turn down the light intensity far enough not to completely blow out the scene.

In the image included here, the light intensity of the spot light I create is set to .25, that's "point 25". The image is still way too lit.

I also experimented with LEM material from the browser with no success.

I'm going to try some of the included ready made interior lights.

spot light.jpg 


bigstick

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Reply with quote  #6 
Have you experimented with the beam angle of the spotlights?

Could you post an example of what happens when you use an LEM please?

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JustinSlick

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Reply with quote  #7 
This is unusually bright for a spotlight at 0.25 light power...

What is the scale of your scene like? That can be pretty important with artificial lights.  But here's a comparison with the Ando Azuma model on the test models page

This is more like what you should be seeing for spotlight brightness with the sketchup dude in there for scale:

spotpower-comparison.jpg 
Both were rendered with the interior default preset, sun/shadows turned off, background set to default using the Podium Night style.






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Bob_CP

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Reply with quote  #8 
I've been unable to get any of these light settings to work well, and I've run out of time at the moment for experimenting with it.

I appreciate both of yours' time weighing in and trying to help.

Bob
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