topic Re: Background image and window frame lightning problem in Visualization

Background image and window frame lightning problem

Anonymous — Thu, 11 May 2023 10:59:53 GMT

Hi everyone.

My windows inside frames (pine material) are too dark.
Background image (cloudy sky) and grass texture are not visible thru the windows. What should I do?

My light settings for this shot were:

Light Sources
150% Ambient (color - light mauve), and Lamps

LW Sun
Color Yellowish, Intensity 80, Light Source 10, Dever. Angle 2 deg.

LW SkyObj.
Color Light Blue, Intensity 60, Lat. 3, Long. 10,

Undersun
Color Yellowish, Intensity 30, Light Source 15

General Light
Positioned behind of the camera, Intensity 40, Color Yellowish, Distance Fall. 1.00, Height 3'

Window Lights up to ceiling
Color Yellowish, Intensity 70, Light Res. 2, Shadow Quality 3 ,Height 3'

Window Lights from ceiling to floor
Color Yellowish, Intensity 70, Light Res. 2, Shadow Quality 2, Height 3'5''

Thanx, chipo

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 11:49:23 GMT

..so many lights , how long does it take to render?

Light Sources
150% Ambient (color - light mauve), and Lamps

- 50% ambient works for most of the scenes, exceeding 100% will make your scene shallow - all the shadows' finest will be flush out

LW Sun
Color Yellowish, Intensity 80, Light Source 10, Dever. Angle 2 deg.

Good, maybe increase diversion angle to 5deg for smooth sun shadows

LW SkyObj.
Color Light Blue, Intensity 60, Lat. 3, Long. 10,

Good, shadow quality at least "4"

Undersun
Color Yellowish, Intensity 30, Light Source 15

Good, tip - set angle at -88deg or less (not -90deg), and azimuth parallel to the camera view axis, this way you will light up side of those beams under the ceiling so it won't look strange

General Light
Positioned behind of the camera, Intensity 40, Color Yellowish, Distance Fall. 1.00, Height 3'

Honestly, I never found this light useful (sorry Dwight )

Window Lights up to ceiling
Color Yellowish, Intensity 70, Light Res. 2, Shadow Quality 3 ,Height 3'

Window Lights from ceiling to floor
Color Yellowish, Intensity 70, Light Res. 2, Shadow Quality 2, Height 3'5''

Generally good, but:

- you can achieve similar effect by setting up several light cones up/down with wide angle and high (0,4 - 1,0) falloff, and it will take less time to compute
- to make windows lights emit enough light you need to increase it resolution (directly or by energy slider) and that means even more time to compute so I would rather keep them for final render

...and finally - what are your settings for glass?

try those neutral settings as a start:
Colour: black
Reflectance -> Glass
- specular - 1,0
- transmission - 0,0
- mirror - 0,15
- roughness - 0,0
- refraction - 1,0
Transparency -> Plain
- colour - black

Cheers

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 14:22:23 GMT

Thanx for replay & tips, tigr.

I have done everything you told to, but the result is not so good.I have even increased ambient light to 60%, but the shot is still very dark and there are no shadows on the floor. Are maybe my sun setting wrong?

Chipo

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 14:29:44 GMT

My sun settings,

Chipo

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 15:16:54 GMT

Ok, we need to clear something up - first of all you need to decide what kind of lighting you're using.
Is it built-in sun (not so good) or lightworks lights (sunobject, skyobject, windowlights) or both.
The first setting box regards built-in sun and if you want that sun to be your primary light, than you need to check "sun" in second setting box / light sources. The finest soft shadows you can get ONLY by using lightworks lights (Sun/Sky/Windowlights/LightCones etc.) and for that you need to check "lamps" in second setting box as you did.

My advice regarding "ambient" was for the one in "Photorendering setting".

About "Undersun" - parallel but oposite to what you have set - so it will lit faces that you can see not the one in other side.

I can see also that you're using the latest - 10 version (lucky you ) so you have some improoved built-in sun (shader) under "Lightworks Environment" - play with that for best results.

I will set similar scene to yours to show you better what I ment.

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 16:14:00 GMT

As I wrote, I use lightworks lights (Sun/Sky/Windowlights/LightCones etc.)
But the settings of built-in sun (more sun dialog) effects on my render (sun is unchecked i photorendering box / light sources).
So could you please tell me your settings in 'more sun / 3d projection settings' dialog.

thanx, chipo

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 17:26:52 GMT

About "Undersun" - parallel but oposite to what you have set - so it will lit faces that you can see not the one in other side.

I have set the "Undersun" parallel and oposite to what I have set before, angel -60°.

try those neutral settings as a start:
Colour: black
Reflectance -> Glass
- specular - 1,0
- transmission - 0,0
- mirror - 0,15
- roughness - 0,0
- refraction - 1,0
Transparency -> Plain
- colour - black

This setting aren't good so I changed glass material to one of lightworks glass material.

Here is the reasult and is still no good.

Re: Background image and window frame lightning problem

Dwight — Mon, 04 Sep 2006 18:23:05 GMT

I liked your first lighting best. It was dramatic.

But as to the grass texture and background photo not working:

1: Background: Have you used the LightWorks dialog to set the background? You can also check a box to "Render Background with Internal Engine" as a shortcut.

2: Grass Texture: Have you transferred the texture to the LightWorks material? A texture created in the internal dialog does not necessarily work in LightWorks unless the "Match Internal…" button is clicked. Make a close-up view of the grass to check because it is far away in the view you show.

BTW: Thank you for the book order.

SEMINAR NOTE: I an providing full-day LightWorks Seminars in Los Angeles, San Franciso and Orange County during early November. Denver late September. See your reseller for more information.

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 20:28:21 GMT

Hi again,

Sorry I didn't respond so long, had to finish some work.
I set up quick scene and try it with the tips I gave you. Results below.
What I used was:

- built-in sun (only for sun burns on the floor)
- sun object (for strong sunlight)
- sky object (shadows off, for warm fill light)
- 7pairs of lightcone down and up, one over another (I found this solution the best/fastest for interiors modeling light)

..and you were right about the glass, I pick the wrong one. I will post some screen shots, too much of typing.

TIP: To avoid square horizont place your model on the big round slab - it will fake infinitive horizont nicely.

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 21:48:49 GMT

...these settings are NOT optimal, just what I used for this particular scene. Hope this helps.

Re: Background image and window frame lightning problem

Anonymous — Mon, 04 Sep 2006 22:38:33 GMT

Grass Texture: Have you transferred the texture to the LightWorks material?

Yes. So there was the problem.

...these settings are NOT optimal, just what I used for this particular scene. Hope this helps.

I will try this settings tomorrow.

THANX FOR THE TIPS.

chipo

Re: Background image and window frame lightning problem

Anonymous — Wed, 06 Sep 2006 13:17:24 GMT

...these settings are NOT optimal, just what I used for this particular scene. Hope this helps.

...it helped. I have attached my new render.

Next thing to do is improvement of grass texture and rail material (chrome?).

thanx, chipo

Re: Background image and window frame lightning problem

Anonymous — Wed, 06 Sep 2006 15:04:46 GMT

Well done. You have some good balance of light and shadow in this scene (much better than mine). I let myself tweak it a little in PS.

For chrome you might look here:

http://archicad-talk.graphisoft.com/viewtopic.php?t=11751

BTW: What are you doing with this cat?

Re: Background image and window frame lightning problem

Dwight — Wed, 06 Sep 2006 15:11:58 GMT

Pawel's metallic is reminiscent of pewter.
you might like to use mirror with some extra distortion or this:

Taken from the Lightworks Surface Archive in Archicad.

Whatever you do, don't make a material using either the chrome 2D or chrome 3D shader.

Re: Background image and window frame lightning problem

Anonymous — Wed, 06 Sep 2006 17:40:12 GMT

tigr wrote:
Well done. You have some good balance of light and shadow in this scene (much better than mine). I let myself tweak it a little in PS.

For chrome you might look here:

http://archicad-talk.graphisoft.com/viewtopic.php?t=11751

BTW: What are doing with this cat?

What kind of effect have you used in PhotoShop?

BTW: Just training rendering.

chipo

Re: Background image and window frame lightning problem

Anonymous — Wed, 06 Sep 2006 19:43:05 GMT

What kind of effect have you used in PhotoShop?

It was not one but few of the routines like:

- desaturate
- levels adjustment
- diffuse glow filter
- blur filter
- brithness/contrast

..don't remember the numbers, just tweak it untill it feels right.

Do you mean you train that cat to do renderings for you?

Re: Background image and window frame lightning problem

Anonymous — Wed, 06 Sep 2006 20:01:44 GMT

tigr wrote:
Do you mean you train that cat to do renderings for you?

Oh, that cat. I thought that you wrote CAD instead of CAT. Sorry.

That cat name is Muco and I'm training him to become first slovenian astronaut.

PS: thanks for tips

chipo