Shadow's Is Odd

[info]

Hi,

I noticed something strange with my model.

I have a fence which goes to ground level (or meets the topo surface).

But the shadow cast by the fence looks as if sun light "shining" is under the fence.  

i.e. the shadow should start from where the fence reaches the ground??

Please see attached, 

[ToanDN]

Model display> Lighting > Lighting in session > Set Ground Level to None.

[info]

Thanks Yeah I've done that, but most of shadows disappear.

I'm not sure what's happening (physically) when the ground level Reference is removed?

(See attached)

[info]

If I create a new lower level (below fence) - and set GRD Level to that. the shadow appears further away from the fence.

Which makes sense because there is a greater vertical distance between the (new) ground and fence. 

[ToanDN]

If your topography is at the correct Elevation then it should cast shadow properly when ground is set to none. You only need to set a level as ground when you don't have any physical ground surface.

[barthbradley]

---

@info wrote:

Hi,

I noticed something strange with my model.

I have a fence which goes to ground level (or meets the topo surface).

But the shadow cast by the fence looks as if sun light "shining" is under the fence.  

i.e. the shadow should start from where the fence reaches the ground??

Please see attached, 

---

Lower your View Range Bottom and View Depth.  

[barthbradley]

Yah, I think it's all about View Range Settings - not so much about Sun Setting's Ground Level.

Here's some examples with no Ground Level:  

[barthbradley]

Is that thick black linework a Wall Cap?  I get odd shadow casting when I model a wall cap too. Still, it's all correctable by adjusting View Range Settings.  

[info]

Yeah that's interesting, because if I delete the topo (all together)  - it does not effect that shadow - which I agree it should. 

Side note: this is how I set a topo surface;

The Topo's vertical position is only relative to the Floor Level, where I've moved the survey point the necessary distance below the floor level to produce  the correct RL - AHD (i.e. in this case is 27.16 meters above sea level or RL  Reduced Level -AHD - Australian Height Datum). And set the level markers base point to: Survey point.

The Topo is the last thing I move, because it's only has absolute levels - i.e. pegged to Internal Origin. 

Please let me know if that does not make sense.  It's a bit of a convoluted process aligning the site levels & topo - this way but it works for me. 

[barthbradley]

Just post your file. Avoid the guessing game. It's fun but grows old quick.   

[info]

Oh. that thick black line is not in the model I've added to the jpg so you can see the top of fence. 

[barthbradley]

Love to examine your file. I kind of bored of playing with hypotheticals that may or may not apply to your case.   

Hey! BTW @info, did you ever figure out that Associated Level issue you posted about on the Structure Forum?  That was pretty interesting.    

[info]

thanks, but I can't post it - it not my model. 

[info]

I've stiped it down to just the model, and shadow diagrams.

https://www.dropbox.com/s/dfwj3lh7buvtefq/revit%20dummy%20model.rvt?dl=0

[info]

let me know when you've downloaded it. 

[barthbradley]

I've downloaded it and removed the Graphic Overrides to the Toposurface and all is well. 

...get rid of the Transparency.  

[barthbradley · Accepted solution]

[info]

ok. That other topic on associated levels & structural forum  - I'm not sure if that was me. 

[info]

You are a LEGEND!