topic Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal. in Archicad C++ API

I would like to know how to create a wall using Wall Geometry Method:Polygonal.

LeeJaeYoung — Tue, 17 Sep 2024 11:14:23 GMT

I would like to know how to create a wall using Wall Geometry.
What sample code can I study?

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

Tim Ball — Sun, 08 Oct 2023 16:54:32 GMT

I work on old buildings a lot where wall thicknesses vary and often are not even parallel. You can either draw the polygon directly or trace over a survey drawing using the space bar click.

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

LeeJaeYoung — Mon, 09 Oct 2023 00:42:58 GMT

thank you.

This is the c++ api forum. ^^

I found Polygon in API_WallType. I think I'll probably use this.
I don't know if it's true.
It hasn't been tested yet.

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

BerndSchwarzenbacher — Tue, 10 Oct 2023 06:41:37 GMT

Yes that's what you are looking for. You will have to use the polygon data in the memos.
Something like this:

GSErrCode CreatePolyWall () { API_Element element {}; element.header.type = API_WallID; ACAPI_Element_GetDefaults (&element, nullptr); element.wall.type = APIWtyp_Poly; element.wall.modelElemStructureType = API_BasicStructure; element.wall.poly.nCoords = 5; element.wall.poly.nSubPolys = 1; element.wall.poly.nArcs = 0; API_ElementMemo memo{}; memo.coords = reinterpret_cast<API_Coord**> ( BMAllocateHandle (sizeof (API_Coord) * (element.wall.poly.nCoords + 1), ALLOCATE_CLEAR, 0)); if (memo.coords == nullptr) { return APIERR_MEMFULL; } (*memo.coords)[0] = { 0.0, 0.0 }; // always has to be (0,0) (*memo.coords)[1] = { 0.0, 0.0 }; (*memo.coords)[2] = { 1.0, 0.0 }; (*memo.coords)[3] = { 1.0, 1.0 }; (*memo.coords)[4] = { 0.0, 1.0 }; (*memo.coords)[5] = (*memo.coords)[1]; memo.pends = reinterpret_cast<Int32**> ( BMAllocateHandle (sizeof (Int32) * (element.wall.poly.nSubPolys + 1), ALLOCATE_CLEAR, 0)); if (memo.pends == nullptr) { return APIERR_MEMFULL; } (*memo.pends)[0] = 0; (*memo.pends)[1] = 5; //index of polygon closing coordinate/vertex memo.vertexIDs = reinterpret_cast<UInt32**> ( BMAllocateHandle (sizeof (UInt32) * (element.wall.poly.nCoords + 1), ALLOCATE_CLEAR, 0)); if (memo.vertexIDs == nullptr) { return APIERR_MEMFULL; } (*memo.vertexIDs)[0] = element.wall.poly.nCoords; for (Int32 vIdx = 1; vIdx <= element.wall.poly.nCoords; ++vIdx) { (*memo.vertexIDs)[vIdx] = vIdx; } memo.edgeIDs = reinterpret_cast<UInt32**> ( BMAllocateHandle (sizeof (UInt32) * (element.wall.poly.nCoords + 1), ALLOCATE_CLEAR, 0)); if (memo.edgeIDs == nullptr) { return APIERR_MEMFULL; } (*memo.edgeIDs)[0] = 0; for (Int32 eIdx = 1; eIdx <= element.wall.poly.nCoords; ++eIdx) { (*memo.edgeIDs)[eIdx] = eIdx; } GSErrCode err = ACAPI_Element_Create (&element, &memo); ACAPI_DisposeElemMemoHdls (&memo); return err; }

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

kency — Thu, 22 Feb 2024 09:17:23 GMT

@BerndSchwarzenbacher @LeeJaeYoung

For me, Archicad crashes with this change when the add-on is invoked. Only if I explicitly change the Wall structure to Basic and invoke the add-on it renders without crashing. I have also tried this on Archicad 26 and 27 and the non-demo version. Please watch the loom video linked here.

Is there any setting that we can use to avoid this? Rather than requesting the user to choose Basic Structure?

I am using MacOS.

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

BerndSchwarzenbacher — Thu, 22 Feb 2024 10:12:50 GMT

Hi Kency,

I was able to reproduce the same issue as you have. It's very weird and I can't think of any explanation why it is like that.
It could be a bug in the API. So you could put a bug report for it with the developer support.

Best,
Bernd

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

kency — Thu, 22 Feb 2024 11:27:50 GMT

Adding the Bug report link here for other community members to track

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

Viktor Kovacs — Thu, 22 Feb 2024 12:42:56 GMT

Seems like a bug. Does it crash even if you explicitly set the wall type to basic in the code?

element.wall.modelElemStructureType = API_BasicStructure;

Re: I would like to know how to create a wall using Wall Geometry Method:Polygonal.

BerndSchwarzenbacher — Thu, 22 Feb 2024 11:40:31 GMT

Yes both in the video from kency and in my tests the wall type was explicitly set to basic and we get a crash.