Life doesnt get much wilder than around the "3 Furlongs".

----- Original Message ----- From: "Jyrki Hokkanen" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, January 05, 2006 3:34 AM
Subject: Re: Shadow Error


Hi Neil

Thanks and thanks, I'd better start saving for those beers.

I'll give you one year for that :-)
I was about to visit Australia and New Zealand this year but chose Southern Africa eventually. I shoot wildlife as a hobby, on video that is. I already have 60 hours DV-tape of Central America; an ocelot, several tapirs etc, never got the jaguar though.

Anyways, when "object space scaling" your scene, remember also to change your bump map heights etc. thingies that do not get scaled in the process.

Cheers
Jyrki


 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



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