topic Lightworks Phantom Light Source in Visualization

Lightworks Phantom Light Source

Anonymous — Thu, 11 May 2023 10:25:07 GMT

I am experimenting with various lightworks lighting options. To start off with (ie. baseline) I want to turn off all lights period to have a black render, then I will be adding various light sources in individually to see how they look.

So to start I have turned all lamps off (and intensity to 0 just in case) and under the PhotoRendering Settings dialog, I have Sun unchecked, Ambient unchecked and Camera unchecked - ie. the only light source is Lamps.

For some reason there is still some light coming into the render (although it is admittedly dark). When the Lamp is unchecked in the dialog it becomes black (as would be expected). I've checked all lamps and they are all correctly turned off.

Is this level of lighting like a base default, or should the image be black in the scenario I'm describing? If so any ideas what I have to change or what might be going on?

Thanks

Re: Lightworks Phantom Light Source

Dwight — Mon, 27 Aug 2007 15:38:17 GMT

Test for errant light by unchecking Lamps as a light source.

Re: Lightworks Phantom Light Source

Anonymous — Tue, 28 Aug 2007 01:30:28 GMT

I'm attaching two pics. The first one shows the scene with two lamps switched on, one in the kitchen at 50% red and one on the patio at 20% violet. All of the other lights are off. I just put this in to show that turning a light on does work as expected -- it is just when turned off they still seem to be lit for some reason.

The second image shows the render with the lamps selection unchecked. It is black (as would be expected) except for a couple of minor sections that show.

I am still confused as where the light source is originating in the original render with all lights turned off and the lamps selection = on.

Re: Lightworks Phantom Light Source

Anonymous — Tue, 28 Aug 2007 01:33:05 GMT

Here is the image with lamps selection = off.

Re: Lightworks Phantom Light Source

Dwight — Tue, 28 Aug 2007 01:51:06 GMT

My take is that you have placed a lamp somewhere, probably a skylight or a sun object. It might be on another storey or very distant from the project.

Use your global selection tool in a 3D view with all layers on and with the entire project in the view - ask for LAMPS. See what shows up.

Re: Lightworks Phantom Light Source

vfrontiers — Tue, 28 Aug 2007 06:29:44 GMT

Some light fixtures also had an option for an "EXTRA" light to increase ambient light. This was a long time ago and I don't know if it still exists. I am not sure of the exact wording in the parameters, but check the existing lights for another parameter that might suggest this.

[I think this parameter used to be called "Brightener Light"]

Re: Lightworks Phantom Light Source

vfrontiers — Tue, 28 Aug 2007 06:31:12 GMT

Could you tell me which lights you've used for the Red and Violet lights?

Re: Lightworks Phantom Light Source

Anonymous — Tue, 28 Aug 2007 14:27:40 GMT

placed a lamp somewhere, probably a skylight or a sun object

I did this, 3D, select all layers, find all lamps, total found and highlighted = 34. All 34 are accounted for and looked to be in the correct position.

Could you tell me which lights you've used for the Red and Violet lights?

The Violet is the Wall Lamp 05 10 on the patio right side and the red is in the kitchen, Halogen Recessed 10.

Some light fixtures also had an option

I looked through the parameters and didn't see anything like this in the lamps I'm using which are:
Halogen Recessed 10
Wall Lamp 05 10
Hanging Lamp 02 10
Floresent Recessed 02 10

Re: Lightworks Phantom Light Source

vfrontiers — Tue, 28 Aug 2007 14:56:38 GMT

Hmmm... I also looked at some of the lights last night and created some VERY BLACK renderings. This was on AC11, tho. I see you are using AC10 lights. I even went into the scripts to see if it was embedded into the scripts without having a parameter to control it...

I'll try and check out the AC10 lights you used, but might be a day or two.

If you call up the 3d window window and SELECT ALL LIGHTS, do you get a count that matches what you know to be lights?

Re: Lightworks Phantom Light Source

Anonymous — Wed, 29 Aug 2007 14:20:58 GMT

If you call up the 3d window window and SELECT ALL LIGHTS, do you get a count that matches what you know to be lights?

Yes, there are only 34 lights in the model, when I do a 3D (on show all layers view) and select all it comes up with 34.....

It is most strange.

Also, I am now working in AC11 (again) but still have AC10 light objects so I can change if I need to. In both AC10 and 11 I got the same thing.....

Re: Lightworks Phantom Light Source

Anonymous — Sat, 08 Sep 2007 14:47:47 GMT

Case solved: Like I said, I had accounted for all lights -- they were not causing the problem. It was a couple of cameras that were set up -- that was the light source. This is even though I had the camera box not checked in the Lightworks light sources area of the Photorendering Settings.

Seems like this isn't how it should work, but anyway, I removed the cameras and the render is now dark (like it should be)!