topic Re: Shadow's Is Odd in Revit Architecture Forum

Shadow's Is Odd

info — Mon, 12 Sep 2022 02:24:41 GMT

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,

Re: Shadow's Is Odd

ToanDN — Mon, 12 Sep 2022 03:15:10 GMT

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

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 07:06:04 GMT

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)

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 07:09:39 GMT

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.

Re: Shadow's Is Odd

ToanDN — Mon, 12 Sep 2022 10:50:25 GMT

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.

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 13:12:03 GMT

@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.

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 13:25:51 GMT

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:

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 13:57:13 GMT

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.

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 14:32:45 GMT

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.

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 14:36:15 GMT

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

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 14:37:46 GMT

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

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 14:42:39 GMT

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.

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 14:55:18 GMT

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

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 15:07:06 GMT

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

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

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 15:07:48 GMT

let me know when you've downloaded it.

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 15:14:50 GMT

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

...get rid of the Transparency.

Re: Shadow's Is Odd

barthbradley — Mon, 12 Sep 2022 15:18:10 GMT

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 15:19:14 GMT

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

Re: Shadow's Is Odd

info — Mon, 12 Sep 2022 15:22:19 GMT

You are a LEGEND!