topic Move several elements to mesh in Archicad C++ API

Move several elements to mesh

tolltech — Mon, 16 Sep 2024 12:45:57 GMT

I have a task to move elements down to mesh. I try to write a plugin, but i can't get all mesh polygons or vertices using API. I need it because I want to change the Z coordinate of other objects to move it closer to mesh. What else can I do? Or maybe is it a way to do what i want? I have tried to build structures API_Element;API_ElementMemo; using API_MeshID, but there is no information about polygons or vertices

Re: Move several elements to mesh

BerndSchwarzenbacher — Fri, 29 Sep 2023 16:52:22 GMT

Hi tolltech!

Maybe the ModelAccess API would help in your case.

In the API there's also a related example called ModelAccess_Test.

For simple objects like walls and doors, I think it would be possible to derive the coordinates for a mesh from the information given in API_Element and API_ElementMemo.

Hope that helps!
Feel free to ask further if you get stuck.

Re: Move several elements to mesh

tolltech — Sun, 08 Oct 2023 05:21:39 GMT

Sad, but i still cant solve my problem, i try to get several models, but i cant see usefull data inside. Maybe i should try use ACAPI_ModelAccess_GetTextureCoord to determine z coordinate, but i cant understand what paramateres i should pass to this function. Please help i have no idea(

My bad tries here:

GS::Array<API_Guid> elemList; ACAPI_Element_GetElemList(API_MeshID, &elemList, APIFilt_OnActFloor); if (elemList.GetSize() > 0) { API_Element mesh = {}; API_ElementMemo memo; mesh.header.guid = elemList[0]; GSErrCode err = ACAPI_Element_Get(&mesh); if (err != NoError) return; //https://archicadapi.graphisoft.com/documentation/api_gridmesh if (mesh.header.hasMemo) { err = ACAPI_Element_GetMemo(mesh.header.guid, &memo); if (err != NoError) { return; } //here deeper ACAPI_DisposeElemMemoHdls(&memo); API_ElemInfo3D mesh3D = {}; err = ACAPI_Element_Get3DInfo(mesh.header, &mesh3D); if (err != NoError) return; API_Component3D comp3D; BNZeroMemory(&comp3D, sizeof(API_Component3D)); comp3D.header.index = 0; comp3D.header.typeID = API_BodyID; //err = ACAPI_ModelAccess_GetComponent(&comp3D); //compilation error if (err != NoError) return; } }

Re: Move several elements to mesh

BerndSchwarzenbacher — Tue, 10 Oct 2023 06:10:08 GMT

Sorry I've completely misunderstood your question before. I thought with "move down to mesh" you mean something like "convert to mesh".

You actually want to get the z-coordinates from a mesh! You can use memo.meshPolyZ for that. Here's a code example:

GS::Array<API_Guid> elemList; ACAPI_Element_GetElemList (API_MeshID, &elemList, APIFilt_OnActFloor); if (elemList.GetSize () > 0) { API_Element mesh{}; API_ElementMemo memo{}; mesh.header.guid = elemList[0]; GSErrCode err = ACAPI_Element_Get (&mesh); if (err != NoError) { return err; } //https://archicadapi.graphisoft.com/documentation/api_gridmesh if (mesh.header.hasMemo) { err = ACAPI_Element_GetMemo (mesh.header.guid, &memo); if (err != NoError) { return err; } ACAPI_WriteReport ("i: (x, y, z)", false); ACAPI_WriteReport ("------------", false); for (GS::Int32 i = 1; i <= mesh.mesh.poly.nCoords; ++i) { ACAPI_WriteReport ("%d: (%f, %f, %f): ", false, i, (*memo.coords)[i].x, (*memo.coords)[i].y, (*memo.meshPolyZ)[i]); } } ACAPI_DisposeElemMemoHdls (&memo); }

Be aware that the meshPolyZ coordinates are relative to the mesh reference plane! So if you want the global z coordinate you also have to take element.header.level and element.header.floor into account.

Hope that helps!
Bernd

Re: Move several elements to mesh

tolltech — Fri, 16 Feb 2024 11:10:14 GMT

Hello again!

Your code works, thanks a lot!

Now I want to change the Z coordiante of objects, i tried like this, but nothng happened

GSErrCode err; API_SelectionInfo selectionInfo; GS::Array<API_Neig> selNeigs; err = ACAPI_Selection_Get(&selectionInfo, &selNeigs, true); BMKillHandle((GSHandle*)&selectionInfo.marquee.coords); GS::Array<API_Guid> inds = GS::Array<API_Guid>(); if (selectionInfo.typeID != API_SelEmpty) { for (const API_Neig& selNeig : selNeigs) { if (!ACAPI_Element_Filter(selNeig.guid, APIFilt_IsEditable)) continue; API_Element element = {}; element.header.guid = selNeig.guid; GSErrCode err = ACAPI_Element_Get(&element); if (err != NoError) continue; element.object.level = 0; ACAPI_Element_Change(&element, NULL, NULL, 0, true); } }

Sorry I am newbie, but it is all I found in google.

Also it is very strange that i see in selected objects. I select two objects, try to see element.object.level and see that the upper object has smaller value in this field

Re: Move several elements to mesh

BerndSchwarzenbacher — Sat, 17 Feb 2024 12:18:35 GMT

You need to specify a mask for ACAPI_Element_Change for the fields you want to change.

So something like this should work (untested):

// ....... element.object.level = 0; API_Element mask{}; ACAPI_ELEMENT_MASK_CLEAR (mask); ACAPI_ELEMENT_MASK_SET (mask, API_ObjectType, level); ACAPI_Element_Change(&element, &mask, NULL, 0, true); // ......

@tolltech wrote:

Also it is very strange that i see in selected objects. I select two objects, try to see element.object.level and see that the upper object has smaller value in this field

This is likely due to the second object being placed on a different story. The field element.object.level is relative to the story base line.

Hope that helps,
Bernd

Re: Move several elements to mesh

tolltech — Mon, 19 Feb 2024 14:27:58 GMT

I have tried this ones, but got the error -2130312307 (or 7003)

API_Element mask{}; ACAPI_ELEMENT_MASK_CLEAR(mask); ACAPI_ELEMENT_MASK_SET(mask, API_ObjectType, level); err = ACAPI_Element_Change(&element, &mask, NULL, 0, true);

API_Element mask{}; ACAPI_ELEMENT_MASK_CLEAR(mask); ACAPI_ELEMENT_MASK_SET(mask, API_Element, object.level); err = ACAPI_Element_Change(&element, &mask, NULL, 0, true);

Re: Move several elements to mesh

BerndSchwarzenbacher — Tue, 20 Feb 2024 15:28:19 GMT

You can check error codes here: https://graphisoft.github.io/archicad-api-devkit/md__common_doxygen_files_2_articles_2_error___codes.html

The error you get is APIERR_NEEDSUNDOSCOPE. So you need to wrap the above code into a ACAPI_CallUndoableCommand scope.