Render appears all black

[kavoom]

Howdy, When I render sometimes the image shows all black. If I adjust lights, make sure they are not inside another object, that their cone fully touches the surfaces, and their intensity and brightness are changed, sometimes the view is still black. This happens even if I create a camera and render from that view. Any thoughts as to why this happens/how to change?

Thanks!

[Anonymous]

When you find out, let me know. I've periodically had the same problems.


wrote in message news:5918075@discussion.autodesk.com...
Howdy, When I render sometimes the image shows all black. If I adjust
lights, make sure they are not inside another object, that their cone fully
touches the surfaces, and their intensity and brightness are changed,
sometimes the view is still black. This happens even if I create a camera
and render from that view. Any thoughts as to why this happens/how to
change?

Thanks!

[kavoom]

I will. This is a problem I've had in the past as well...Now I'm teaching a class and students are sometimes having this issue. I'm not sure if its the computers or some setting in the file...

[Anonymous]

Doug Broad wrote:
> When you find out, let me know. I've periodically had the same
> problems.

*periodically*??!
I *always* have this problem.

It *kills me* that,
in most rendering software,
you can specify the *wattage* of an incandescent lamp.
Yet when you place that light source inside a 10'x10' interior space,
(with no windows, or other light sources)
and render, you will get a jet-black image.
why?
I mean, if you can specify the *wattage* of a bulb,
that would lend one to beileve that you'll achieve real-world results.
(with the default settings active...)

Most Render professionals just shrug this complaint off,
whenever I bring it up: "You need to add a coupla omni lights"
they say. But why? Why do I have to add supplemental "hidden"
omni-directional light sources, when I have a perfectly good 100w bulb in
the room?!!

Seems like someone would have worked it out by now,
that you could render a model *without any light sources*
by just using a default ambient lighting level.

Oh, wait, someone already did:
Accurender v.3
Sure, it didn't have "radiosity" or "final gather" capabilities.
But you could load a Model, and press Go, and get a rough image.
Why can't modern rendering engines do that?

Someday, rendering will be *easy*.
The steep re-learning curve I'm subjected to
each time I attempt a rendering (not that often, maybe 2-3 times a year...)
is very frustrating....

--
Halten Sie an! Oder meine Mama wird Schießen!

[Anonymous]

I have black renders even with default lighting. It depends on the material though. I
was trying to show someone how to add a render material to a view block of a multiview
block and after I finished, I rendered and there was nothing there. Pretty embarrasing.
Thankfully I thought of adding a 3dface without a material attached (default) and placed
it behind the object that should have rendered. It rendered fine. The one I put the
material onto rendered black. Still haven't figured that one out.

"Corey A. Layton" wrote in message
news:5918406@discussion.autodesk.com...
Doug Broad wrote:
> When you find out, let me know. I've periodically had the same
> problems.

*periodically*??!
I *always* have this problem.

It *kills me* that,
in most rendering software,
you can specify the *wattage* of an incandescent lamp.
Yet when you place that light source inside a 10'x10' interior space,
(with no windows, or other light sources)
and render, you will get a jet-black image.
why?
I mean, if you can specify the *wattage* of a bulb,
that would lend one to beileve that you'll achieve real-world results.
(with the default settings active...)

Most Render professionals just shrug this complaint off,
whenever I bring it up: "You need to add a coupla omni lights"
they say. But why? Why do I have to add supplemental "hidden"
omni-directional light sources, when I have a perfectly good 100w bulb in
the room?!!

Seems like someone would have worked it out by now,
that you could render a model *without any light sources*
by just using a default ambient lighting level.

Oh, wait, someone already did:
Accurender v.3
Sure, it didn't have "radiosity" or "final gather" capabilities.
But you could load a Model, and press Go, and get a rough image.
Why can't modern rendering engines do that?

Someday, rendering will be *easy*.
The steep re-learning curve I'm subjected to
each time I attempt a rendering (not that often, maybe 2-3 times a year...)
is very frustrating....

--
Halten Sie an! Oder meine Mama wird Schießen!

[calfcreek]

Yes, I have an interior model I'm working on. I added bulbs (1000watt mercury) to the gym lighting and they worked very well. I have some rooms beyond with glass in the doors so I thought I would add a 100w bulb in there just to give a little glow to the windows. These areas render black.
Just curious...do you have the render setting to "Logorythmic"?

Keith D. Rodebush
SGAI

[Anonymous]

If your using photometric lighting (LIGHTINGUNITS set to 1 or 2) try a freeweb in that room and up the intensity until you get a good result. They can only be accessed by typing freeweb at the command line. Just a thought, as they work well in that situation for me.

[allanr]

I was looking for answers to this and found this thread which still has no proper reply after 6 years.......... you are most likely in parallel projection mode type "perspective" and change value to 1 if you have a your background active you should see it pop in at this point. render away van gogh

[chamalj]

1. Put a light with an intensity ration of 100 or more

2. Bring your object in to x,y,z positive sides

It works !

[timpy6]

Whether it be 3DS Max, Maya, Revit, or AutoCAD ... I'm still amazed at how many times it was because someone placed the camera so far back into the corner of a room (to get a wide angle) that the camera was inside the wall. The render will show black even if the lens appears to be safely outside the wall and you can still see the view in the viewport just fine.

If it's black while using the Arnold renderer (Maya) then usually the light intensities are way too low for the light falloff "quadratic" setting. The lights fall off too quickly.

If you're not using global/ world/ environment/ sun lights then you need more powerful indoor lights.