topic Re: Shadow/darkness Intensity in Visualization

Shadow/darkness Intensity

Djordje — Thu, 11 May 2023 11:01:17 GMT

wr1nkles wrote:
Is there any way that this dark (Almost Black) area can be decreased so that i am able to see the "actual colour/texture" of the under side of this roof.

The reason i say this is that in "real life", you can still see the underside of a roof and the texture, not just darkness.

///

Also, can this be fixed in any other way than placing a light next to the area, or modifying the position of the light/sun objects.

Yes.

By Graphisoft licensing Radiosity module for Lightworks.

Until you do the Radiosity, the shadow will be black until you put in the fill light.

But:

Think about this:

In life, we NEVER stare at one point, our gaze flits around and the eyes adjust automatically. So, therefore, if you do stare at the sun drenched wall, the shadow next to it IS black - at that exposure. Only, your eye already saw the underside at the roof at a different exposure, and your mind is automatically making a composite image.

Hm?

Re: Shadow/darkness Intensity

Dwight — Wed, 23 Feb 2005 16:40:37 GMT

soffit darkness is a serious issue. I cope by making the material assigned to soffits glow - a constant, or highly reflective to ambient and diffuse light.

Yes, it is artificial...... and not necessarily solved by radiosity.....

Re: Shadow/darkness Intensity

Dwight — Thu, 24 Feb 2005 12:52:28 GMT

If you think of the lightworks engine parallel to photographing the building, the same problems occur as faced by a photographer.

Radiosity can solve these problems because you can make light rays decay at a slower rate than in reality, activating and illuminating dark corners.

Shooting upward aganst a bright sky, soffits will be murky.

But I sense a mood change as the frustrations of LightWorks begin to appear among our users. Believe me, writing a book about solving these problems is a big chunk of raw meat and me with no knife or barbeque.

I feel like those guys in "Quest For Fire." My version, shivering here dressed as I am in ArchiCAD's raw fur object is called "Quest for LightWorks," as I rub two stick objects together trying to make soft shadows.

Re: Shadow/darkness Intensity

Dwight — Thu, 24 Feb 2005 20:57:17 GMT

nikrink expostulated: "reality of the picture."

ha!

the choice is simple - everything should look like Kodachrome on a sunny day!

What do you think people want to say "yes" to? "Happy happy happy", or "gloom gloom doom?"

Unless you are making "Minority Report."

Re: Shadow/darkness Intensity

Vitruvius — Fri, 25 Feb 2005 03:35:47 GMT

Nik,

Therein lies the nub of the issue. On one hand you have advice to "think like a photographer" yet on the other, most architects wield a camera and know that buildings just don't look like rendering engines make them look. And soffits certainly don't glow in reality!

You can get a great interior shot of the Pantheon, single source illumination via a 30' oculus 135' in the air - but - no computer rendering programme I've seen will give a similar result with the same lightsource.

All the tricks and tips really underline the basic crudeness of rendering programmes - it takes a lot more to make them look real than it would in reality!

I'm personally very curious about rendering but I don't use it for presentations because, quite frankly, it's way too technical and mastering it probably isn't profitable for most architects. A lot of architects can draw very well but renderings always go to specialists for a good reason - work flow and productivity.

But, I'll keep plugging away at it as well.

Cheers!

Re: Shadow/darkness Intensity

Dwight — Fri, 25 Feb 2005 04:18:22 GMT

absolutely correct! We all feel so betrayed that rendering is not "automatic." And that the people who made the system themselves might be skilled programmers but lack the artistic sense to make it go smoothly.

I give the advice to "think like a photographer" because photographers arrive with enough lights to make a space illuminated well enough to photograph and know how to dodge and burn their enlargements [or digital files] to bring out all the details. Totally unlike reality - more like the accumulated space memory so important to real estate sales.

In the case of the soffit, or any underlying element, the thing turns black without some special treatment. So for people actually interested in representing their work, I humbly hope that solutions like these can penetrate the consciousness of our community.

Illustration remains something that is best practiced by a specialist. Most of my work is for ArchiCAD users who have a complete model but lack the knowledge to create a passable rendering. I can't hope to complete with the really high-end [who aren't using ArchiCAD] guys having ten networked computers on their shelf to rapidly prove and then render jobs in short order.

Re: Shadow/darkness Intensity

Vitruvius — Fri, 25 Feb 2005 05:31:57 GMT

Dwight,

If I'm going to "think like a photographer" and have to haul around my 2x2 Hasselblad and all them lights and reflectors (metaphorically speaking) - why would I want to shoot architecture?

Photographers have done wonders with nothing more than Sol, a tropical beach, Hawaiian Tropic and....

Cheers,

Re: Shadow/darkness Intensity

Dwight — Fri, 25 Feb 2005 05:45:24 GMT

the use of light modulation goes back a long way. And there's no beach that yields a publishable photograph without some kind of fill or scrim.

Re: Shadow/darkness Intensity

Dwight — Fri, 25 Feb 2005 22:17:00 GMT

too bad Gehry's Disney Center in Los Angeles has all of those black garbage bags on the back tower. Think maybe the neighbors didn't like the glare?

Re: Shadow/darkness Intensity

Dwight — Sat, 26 Feb 2005 03:20:30 GMT

true.

Re: Shadow/darkness Intensity

__archiben — Sun, 27 Feb 2005 01:50:19 GMT

Vitruvius wrote:
Photographers have done wonders with nothing more than Sol, a tropical beach, Hawaiian Tropic and....

or a box with a hole?

~/archiben

Re: Shadow/darkness Intensity

Dwight — Sun, 27 Feb 2005 02:13:36 GMT

those are great links! Almost as great as Link himself.

My artificer made me a pinhole as a gift but I've never used it.

[Harder to do it than you think]

Imagine the hybrid of high technology and low technology: the digital pinhole camera!

Re: Shadow/darkness Intensity

__archiben — Sun, 27 Feb 2005 09:20:11 GMT

i saw an exhibition put together by the guys from pinhole.cz in prague several years ago. there was a link to a page on their website where you could download a PDF file for the original dircon paper pinhole camera - to make your own.

i got as far as cutting the pieces out, but sadly never had a chance to put them together and experiment.

if you're interested, the link still exists and can be found here. go learn about that shadow/darkness intensity (and more)!!!

cheers
~/archiben

Re: Shadow/darkness Intensity

Dwight — Sun, 27 Feb 2005 12:55:02 GMT

I just knew you guys would have a different word for trollop.

Re: Shadow/darkness Intensity

__archiben — Mon, 28 Feb 2005 03:54:36 GMT

wr1nkles wrote:
btw, did you watch tropfest tonight?

huh?

Re: Shadow/darkness Intensity

LiHigh — Wed, 02 Mar 2005 07:04:26 GMT

can this be fixed in any other way than placing a light next to the area, or modifying the position of the light/sun objects.

Yes, indeed. I would just place a Sun Object and set the parameters:
1) Set Sun Position manually-ON
2) Sun Altitude= -90 degree.
3) Cast shadow--OFF.

Re: Shadow/darkness Intensity

Dwight — Wed, 02 Mar 2005 15:25:07 GMT

ooo eee.

Re: Shadow/darkness Intensity

Dwight — Wed, 02 Mar 2005 15:25:34 GMT

eee ooo.

Re: Shadow/darkness Intensity

Dwight — Wed, 02 Mar 2005 16:45:44 GMT

Fantastic!

I will now have to throw away half of my book.

Here's a one sun sun object from directly below with no shadow. Negligible increase in render time.

Observe the underside of the sphere....

I am going to write to the pope: "Saint LiHigh"

Re: Shadow/darkness Intensity

Dwight — Wed, 02 Mar 2005 21:41:12 GMT

the sunfromhades light source is straight up, from below and casts no shadows. Therefore, light energy will only fall on surfaces facing downward and the additional source won't contribute to the general scene lighting. AYMK {As You May Know} lamps with no shadows often penetrate solid walls....

In this rendering, the hellsun is in addition to all the lites in the last rendering - already having a windolite uplite inder the sphere, a sun with weak shadows, a soft sun object ambient lite and a skylight object.