Document & Visualize forum
cancel
Showing results for 
Search instead for 
Did you mean: 

Transparent ceiling that blocks light (for top-view render)?

Anonymous
Not applicable
Hello,

I've run into a bit of a problem: I'd like to render a top-down isometric view (showing the layout and surfaces of all in the worksite), but when there's no covering blocking abiant light (when I exclude it form the 3d view), everything is 'blown out' by the ambiant sunlight shining through the hole that is the no-ceiling... yet I want that light to shine in through the -windows- of the top-view, but not from above.

It seems that there is no material I can create that will both allow one to see through it -and- block ambiant light (defying the laws of physics, what), and I've tried creating a story above and creating a 'floor' there to see if that affects the render... to no avail.

Does anyone have any suggestion about how to get around this?

Thanks, best,

Josef.

PS: I even tried to make a reflective, but transparent surface (sort of a 'polariser')... no dice.
8 REPLIES 8

Anonymous
Not applicable
So you mean you mean that you want a isometric view with the hard shadows of the sun coming from the windows but not from above the ceiling?

Do you have outside elements too, like parking, trees, etc, that you want also the sun to affect? or is just the building?

Probably if you show us a picture of what you want it can be easier to help.

As far as I understand I don't know a way of doing that, I have never done it, and probably you will need to go to a 3D software to render, where you can tell the ceiling to not show in the 3d view.

This makes me curious let me think about it...

Anonymous
Not applicable
Hello, thank you for your reply.

No, no outside elements; just an interior view.

Here is a rendition that I managed (using directional 'artificial' light and no sunlight):

Anonymous
Not applicable
Oh! that looks great!

Anonymous
Not applicable
Thank you!

Here's another one I rendered last night: I got to there by putting a slab over the sunlight object, and a wall above that, all 'painted' in a custom matte black no-reflect surface... still getting some 'parasite' sunlight over the top, though. I think it -is- possible, though I wish there was an easier way.

It would be nice to have an object/slab setting that would tell it to 'behave' normally (reflect, block light, etc.), but just not show in the render.

alemanda
Beginner
I'm not sure it is possible at the moment ... I wish GS implement this functionality soon ... It's a must when you do interior renderings. It is very helpful technique to have good perspective (I mean not so distorted perspective)
AC 19 and AC21 latest hotfix
Win 10 Pro 64bit
Double XEON 14 CORES (tot 28 physical cores)
32GB RAM - SSD 256GB - Nvidia Quadro K620
Display DELL 25'' 2560x1440
www.almadw.it

Anonymous
Not applicable
Hey, just an update:

I managed to get pretty well the effect I wanted, through elimnating all sunlight and replacing that with 'sun objects'.

I'm a photographer, so delved into my bag of studio techniques to come up with this: almost all the top and bottom area of the white field around the model is a 'neo-hidden' slab whose altitude is -just- above the window opening and inches away from the outer wall... the top surface is a (custom) white matte with all reflectivity turned off, and the bottom and sides are a (custom) non-reflective black matte. We use polysterene panels exactly like this in studio photography.

Directly underneath it is a directed sun object that uses 'global light' and 'in one direction only' illumination settings.

With this I got totally black wall-tops... which was initially what I wanted, but the end result seemed a bit 'stark', so I added a 'global' light around eight metres above the scene, set with 'no falloff' and 'no shadows'... that illuminated the wall-tops/moldings and cabinet-tops enough to show what they were (without leaving a black 'hole' as they were without this light).

Anonymous
Not applicable
That's great, and thanks for sharing the tricks!!

Anonymous
Not applicable
I also looked into cutting planes, but they allow light to pass through. Unless I've missed something.

It would be quite useful if they had an option to be transparent but block lighting effects... it could be used for any cut-plane view.

Start a new conversation!

Labels

Still looking?

Browse more topics

Back to forum

See latest solutions

Accepted solutions

Start a new discussion!