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I'm trying to create a daylight link which will look to see which surfaces exist before it targets.
So i have 2 layers Ground level and Peat level. Where I have peat, I want the earthworks to extend down but if the peat surfaces doesn't exist I want it to target the Ground level.
I think this is easy to do I just can't work out the formula to stick in the decision part.
You will want to use an auxiliary point to target the surface and then use the .isvalid API function to see if the auxiliary point is valid. So if the auxiliary point is AP2 then the decision would be AP2.isvalid. Hope that helps!
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I'm curious if this will work for you. I've had trouble with trying to create aux. points on surfaces that don't exist. In my case, the aux. point was trying to be created beyond the boundary of the surface, but I think you may run into the same issue. When the AP cannot be created, then the sub stops running before it can get to the decision and produces an error.
Within the composer it seems too work just fine. It might be worth noting that i'm using this in a slightly different way now.
The link will always fire to the topo layer but if the peat layer exists it will continue down to the peat layer. I decided to do it this way so i can always keep my slopemarkings folllowing the topo then a second different set for the section through peat.
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