Hi Jyrki,
Magic ... now I owe both you and Frank a beer down at the "3 Furlongs".
And thanks for the note:
the optimal dimensions for a scene are of the order 1.
My trap there, apart from ignorance was that I now draw all projects to the
same scale so that I could swap things between jobs etc ... unfortunately I
had decided to call the properties box numbers millimetres and the current
scene is kilometres so the numbers go crazy. The reason the old file is
showing problems is because I set it up before deciding on the scale system
I used for everything else. So, keep things around 0 to1 ... I guess this is
IEEE consideration or something.
Thanks and thanks, I'd better start saving for those beers.
Neil Cooke
----- Original Message -----
From: "Jyrki Hokkanen" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, January 04, 2006 11:01 PM
Subject: Re: Shadow Error
Hi Neil
Attached JPG shows a render from a perspective camera and on the
right an ortho camera. Analytic cylinders show an incorrect dark
artifact that is not possible from the lighting.
I noticed that your scene is huge in size. Select the "root" level, open
property window, scale all dimensions of the "object space" by a factor of
0,0001 and render. This removes the artifacts from your example column, at
least.
I suspect that the ray tracing calculations for shadow rendering go wrong
due to rounding errors, when dealing with such a big scene. I think that
the optimal dimensions for a scene are of the order 1.
Cheers
Jyrki
