One light and two shadows!

Get feedback from others on your works in progress
User avatar
contegufo
Posts: 521
Joined: Tue Aug 11, 2015 8:41 am
Location: Lucca ITALY

One light and two shadows!

Post by contegufo » Sun May 01, 2016 7:32 am

Hi

It may sound strange but it is so but it's not a trick!
We Cinema4D and after having placed the chair on the set with curved background I created a light object: create> disc.
The disc is a circular ring, activating the slice command remains the top which was given an emissive material or the light, the one and only.
From the screen it comes from Cinema 4D you can appreciate two shadows due to the annulus emissive. In practice the two extreme sides of the annulus produced two shadows as if there were two lights.
In the other image the crown was then moved to the right side of the scene with an interesting shadow and the object etched well.

I hope this starting point can be better understood by the friends of the forum.
Indigo4 CPU rendering, 1h.

Thank you!
Attachments
disc.jpg
chair.jpg
Mac Mini 2011 - 2,3 GHz Intel Core i5
16 GB 1333 MHz DDR3 - Intel HD Graphics 3000 512 Mb.
Samsung SSD 860 EVO 500GB - MacOS High Sierra 10.13.6



https://www.behance.net/Paolo_Conti

User avatar
Oscar J
1st Place Winner
Posts: 2197
Joined: Sat Mar 31, 2012 3:47 am
Location: Gothenburg, Sweden
3D Software: Blender

Re: One light and two shadows!

Post by Oscar J » Sun May 01, 2016 8:03 am

Hm, I think that is most likely correct shadow behaviour. :)

Nice scene by the way, though you should try three point lighting. :)

User avatar
CTZn
Posts: 7240
Joined: Thu Nov 16, 2006 4:34 pm
Location: Paris, France

Re: One light and two shadows!

Post by CTZn » Sun May 01, 2016 10:50 am

I remember I used an open portion of a torus for lighting (from the inner side) and got similar results. Curvilinear lightings seem to do this.
obsolete asset

User avatar
pixie
Indigo 100
Posts: 2258
Joined: Sat Dec 29, 2007 4:54 am
Location: Away from paradise
3D Software: Cinema 4D
Contact:

Re: One light and two shadows!

Post by pixie » Sun May 01, 2016 8:59 pm

CTZn wrote:I remember I used an open portion of a torus for lighting (from the inner side) and got similar results. Curvilinear lightings seem to do this.
area lights aren't one only light, but a multitude of small lights...

User avatar
CTZn
Posts: 7240
Joined: Thu Nov 16, 2006 4:34 pm
Location: Paris, France

Re: One light and two shadows!

Post by CTZn » Mon May 02, 2016 12:54 am

pixie wrote:
CTZn wrote:I remember I used an open portion of a torus for lighting (from the inner side) and got similar results. Curvilinear lightings seem to do this.
area lights aren't one only light, but a multitude of small lights...
They used to be, and not with Indigo anyway ? It's real surface emission nowadays isn't it. I'm certain of what I remember about weird shadows from twisted emitting surfaces !
obsolete asset

User avatar
pixie
Indigo 100
Posts: 2258
Joined: Sat Dec 29, 2007 4:54 am
Location: Away from paradise
3D Software: Cinema 4D
Contact:

Re: One light and two shadows!

Post by pixie » Mon May 02, 2016 4:49 am

CTZn wrote:
pixie wrote:
CTZn wrote:I remember I used an open portion of a torus for lighting (from the inner side) and got similar results. Curvilinear lightings seem to do this.
area lights aren't one only light, but a multitude of small lights...
They used to be, and not with Indigo anyway ? It's real surface emission nowadays isn't it. I'm certain of what I remember about weird shadows from twisted emitting surfaces !
light interference with itself? As you have places where there's light and the hole... quantum indigo? xD

User avatar
contegufo
Posts: 521
Joined: Tue Aug 11, 2015 8:41 am
Location: Lucca ITALY

Re: One light and two shadows!

Post by contegufo » Mon May 02, 2016 5:40 am

Hi

In fact we would have had the same two shadows?
Or Indigo is in crisis on particular emissive forms?

The world of light area deserves to be investigated because it may hold pleasant surprises.
Otherwise it is just only recommend square / rectangular shapes because other forms can lead to misleading results.
So instead of an object bend replace it with a number of other small emissive objects that follow the curvature.
Mac Mini 2011 - 2,3 GHz Intel Core i5
16 GB 1333 MHz DDR3 - Intel HD Graphics 3000 512 Mb.
Samsung SSD 860 EVO 500GB - MacOS High Sierra 10.13.6



https://www.behance.net/Paolo_Conti

User avatar
Oscar J
1st Place Winner
Posts: 2197
Joined: Sat Mar 31, 2012 3:47 am
Location: Gothenburg, Sweden
3D Software: Blender

Re: One light and two shadows!

Post by Oscar J » Mon May 02, 2016 5:50 am

The result is most certainly correct. It will make sense if you think about it a little. :)

User avatar
pixie
Indigo 100
Posts: 2258
Joined: Sat Dec 29, 2007 4:54 am
Location: Away from paradise
3D Software: Cinema 4D
Contact:

Re: One light and two shadows!

Post by pixie » Mon May 02, 2016 6:51 am

contegufo wrote:Hi

In fact we would have had the same two shadows?
Or Indigo is in crisis on particular emissive forms?

The world of light area deserves to be investigated because it may hold pleasant surprises.
Otherwise it is just only recommend square / rectangular shapes because other forms can lead to misleading results.
So instead of an object bend replace it with a number of other small emissive objects that follow the curvature.
Have you tried rendering it on c4d render? I bet it gives you the same result, shadow wise...

User avatar
pixie
Indigo 100
Posts: 2258
Joined: Sat Dec 29, 2007 4:54 am
Location: Away from paradise
3D Software: Cinema 4D
Contact:

Re: One light and two shadows!

Post by pixie » Mon May 02, 2016 7:15 am

c4d behaves just the same
Attachments
1lighttwoshadowsscene.jpg

User avatar
CTZn
Posts: 7240
Joined: Thu Nov 16, 2006 4:34 pm
Location: Paris, France

Re: One light and two shadows!

Post by CTZn » Mon May 02, 2016 12:45 pm

The reason is tricky to explain, better if you do it yourself: animate the rotation of the shape clockwise around its center.

The vertical portions of the emitting half-thing are catching up with the vertical legs. It should show up if you rotate either.
obsolete asset

User avatar
contegufo
Posts: 521
Joined: Tue Aug 11, 2015 8:41 am
Location: Lucca ITALY

Re: One light and two shadows!

Post by contegufo » Wed May 04, 2016 5:27 am

Hi

The scene as 4 lights but only two activated Indigo gui, the secret is in the light balance.
Attachments
2light.jpg
Last edited by contegufo on Wed May 04, 2016 6:52 am, edited 1 time in total.
Mac Mini 2011 - 2,3 GHz Intel Core i5
16 GB 1333 MHz DDR3 - Intel HD Graphics 3000 512 Mb.
Samsung SSD 860 EVO 500GB - MacOS High Sierra 10.13.6



https://www.behance.net/Paolo_Conti

User avatar
Oscar J
1st Place Winner
Posts: 2197
Joined: Sat Mar 31, 2012 3:47 am
Location: Gothenburg, Sweden
3D Software: Blender

Re: One light and two shadows!

Post by Oscar J » Wed May 04, 2016 5:31 am

Hi contegufo, try making one light cold and one warm in colour for a more interesting mood. :)

User avatar
contegufo
Posts: 521
Joined: Tue Aug 11, 2015 8:41 am
Location: Lucca ITALY

Re: One light and two shadows!

Post by contegufo » Wed May 04, 2016 7:03 am

Hi Oscar

Right light 4800K and 6500K light front, Floor and ground Exp. = 5, Specular reflect.
0.300 M samples / s. 36 min.
Attachments
2 light.jpg
Mac Mini 2011 - 2,3 GHz Intel Core i5
16 GB 1333 MHz DDR3 - Intel HD Graphics 3000 512 Mb.
Samsung SSD 860 EVO 500GB - MacOS High Sierra 10.13.6



https://www.behance.net/Paolo_Conti

User avatar
contegufo
Posts: 521
Joined: Tue Aug 11, 2015 8:41 am
Location: Lucca ITALY

Re: One light and two shadows!

Post by contegufo » Sat May 07, 2016 6:06 am

Hi

Glass is one of my obsessions!
Attachments
quickrende2r.jpg
glass.jpg
Mac Mini 2011 - 2,3 GHz Intel Core i5
16 GB 1333 MHz DDR3 - Intel HD Graphics 3000 512 Mb.
Samsung SSD 860 EVO 500GB - MacOS High Sierra 10.13.6



https://www.behance.net/Paolo_Conti

Post Reply
17 posts

Who is online

Users browsing this forum: No registered users and 1 guest