Can a object

Roland4

How can an object lighting itself, so that it casts shadows ?

Dave Savage

Do you mean like this? (see picture below)

First delete all light from your scene and do a test render to make sure that all you get is solid black.
Then make sure your global ambient is set to fully white (that's the little colour bar underneath the Shadow Intensity icon in the Sky&Fog; tab)

You're then ready to create the object which is going to be a light (in this case a simple sphere but it can be anything).
Set the material on the sphere to be Diffusion fully white and Ambient fully white and then in the material options, turn off Cast Shadows (yes this seems a bit counter intuitive but it is the light source which will cast the shadows not the object).

Then create a radial light inside the object and because the object is set to not cast shadows, the light will pass through the object without needing to make it transparent and make it look like the object itself is emitting the light.

Hope this helps.

Roland4

TheSavage64 said:

and then in the material options, turn off Cast Shadows (yes this seems a bit counter intuitive but it is the light source which will cast the shadows not the object).

Yes this help a little bit, but i dont understand what you said above. How can i do this: turn off

Dave Savage

1. In the Material Lab, click the little triangle icon to reveal the drop down menu.
2. Click your selection so it doesn't have a tick.

Roland4

Oh, thank you very much, now i understand.

Horo

@Roland4 - Another way is rendering with TA and boost light. The sphere has some pinkish ambient, ambience is controlled by a hyper texture. There is no light source in the scene. David recorded a video how to create a hyper texture and several other lighting strategies for true ambience. For many of them I have Memos (1 page PDF that compiles the video in a very condensed form) on my website (see sig). Go to Bryce Documents > Memos > Materials > Hyper Texture.

GussNemo

Being able to do things in several ways is always nice.

Roland4

Thank you all for the valuable explanations. I have tried this from TheSavage64, but I have see no shadows.

@Horo

Thank you. I have download the PDF to a USB stick in a internet cafe. I have now for about a week, no own internet and i can not upload my images.

Roland4

@TheSavage64

Now i have shadows. I must select the option soft shadows in render settings. Its fantastic.

@ Horo

I tried your suggestion, but it is currently too difficult for me. I have not get a reasonable result.

Dave Savage

Glad you got it working Roland. :-)

ueany

Interesting discussion here. I already wondered how to set up self-illuminating objects in Bryce (objects from any shape that emit light).
I guess it's not directly possible so we have to fake it.
With enough point lights it's possible to light up every object, for example tube or neon lights.
Settings in both images: very quick render (few minutes), no TA, soft shadows for the lights
You can also give those lights volume to make the illuminating object glowing a bit which would be even more realistic.

Roland4

The image with the font I like it.

ueany

Thank you, Roland.