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leeminardi
en respuesta a: Anonymous

I opened your file and place a wall between the moons and the earth, turned on your Distantlight5, set shadow type on and to Sharp and got no shadows for the moons.  Do not use shadow maps.  Usually if you want softer shadows you would turn on final gather and other global illumination effects.  These features do not make sense for celestial objects that are getting very little indirect lighting.

 

I then turned off Distantlight5 and added a new Distantlight1 that went from the sun (0,0,0) to the center of the earth.  As you can see the shadows do not fall in line with the direction from the sun to the earth but are transposed to the right. I am not sure why this is. 

 

 

r1.png

 

I do not think the problem you are having is due to the drop off of a distant light’s intensity.  There is no fall off that I can see.

 

The scale of your drawing is very large.  Although AutoCAD has a double precision data base (64 bit with 56 bit mantissa) I am not sure of the precision for rendering operations.

 

I suggest scaling the entire model so that the range of values is less than a million to one.  If you are trying to create a relistic image that should be good enough.  If you are doing astronomical calculations I suggest you look into another tool.

 

3DS Max has much better lighting feature but only a 32 bit data base.

 

I hope this helps.

 

~Lee

lee.minardi