what's this?

[rtd]

Hello again,
Attached is a very simple scene. I've hidden just about everything that can be hidden.
Rendered with Easy07; one point light, strength=6, color=white, size=1.2" rad., located with it's center 8" below the ceiling which is RGB240,240,240.
My question: what's with the shape of the light pattern on the ceiling? What's causing it?

[Frederik]

With only an image of the render and not a shot from SU or the simple model - really difficult to answer...

I can only give you a guess... I assume this is caused by the light-component sharing the mesh with the ceiling...
Have you tried moving the light down a bit...??

[Chris]

If you mean, why isn't it circular, my guess is because you are using a material with some reflection to it (almost all the templates have some measure of reflection to them). So you see the circular pattern that results from simple diffusion / scatter, and you see an actual reflection of the light in the parabolic shape stretched toward the eyepoint.

If you mean something else, you'll have to be more clear.

[rtd]

1. Per the original post, the lamp is centered 8" below the ceiling; this should be enough as the manual only asks that it not be touching a surface.

2. The material is standard template flat paint.

I had thought that the lamp itself might be rendering; does it?

[Chris]

1. You are right that the light is not intersecting the surface.
2. Flat paint has a small amount of reflection, so what you are seeing is actually reflection of emitted light (as opposed to diffuse scattering).

And no, the lights themselves provide no rendered geometry. Only the emission of light.

[Fletch]

Chris is telling you that you are seeing 2 kinds of light on your ceiling... the "circle" of direct light shone by the light component (assume it is an omni/point light) and the long specular reflection in the paint of the ceiling... of the approximate size of the omni/spot light .

It looks like the radius of your light bulb is very large - make the size of the light radius as true to life as possible. (not the glass part of the light bulb, but the actual filament of the bulb = .5cm radius maximum, or about .25" radius)

[hvanessen]

I know what is perhaps wrong, but what i like to know is this.

In sketchup you can use KT_Lights wich are lamps who works with kerkythea. Is there also a set of lamps to use with twilight or must you make your lamps by your self. Perhaps anyone had some models.

[Fletch]

Licensed users have access to premade light fixtures, and many things not available to trial version users.