topic Re: Why is the UV obtained through ACAPI_ModelAccess_GetTextureCoord API different from ArchiCAD? in Archicad C++ API

Why is the UV obtained through ACAPI_ModelAccess_GetTextureCoord API different from ArchiCAD?

sxs — Fri, 13 Jun 2025 03:08:33 GMT

Hi,everyone:

In ArchiCad:

In my Render System：

It is obvious that the size of the texture is inconsistent（Ignore color）.

I'm pretty sure the exported texture file is fine, so I think it's a UV issue.

//texture API_TexCoordPars pars = { 0 }; pars.elemIdx = elemIdx; pars.bodyIdx = bodyIdx; pars.pgonIndex = j; // pars.surfacePoint.x = backCo.x; pars.surfacePoint.y = backCo.y; pars.surfacePoint.z = backCo.z; err = ACAPI_ModelAccess_GetTextureCoord(&pars, &resultUV); if (err == NoError) uv.push_back({ resultUV.u, resultUV.v });

Re: Why is the UV obtained through ACAPI_ModelAccess_GetTextureCoord API different from ArchiCAD?

sxs — Mon, 16 Jun 2025 07:07:19 GMT

if (err == NoError) uv.push_back({ resultUV.u / xSize, resultUV.v / ySize });

It seems that the following actions need to be taken.But the xSize/ySize I get can not produce the correct effect.

Re: Why is the UV obtained through ACAPI_ModelAccess_GetTextureCoord API different from ArchiCAD?

sxs — Wed, 25 Jun 2025 08:08:57 GMT

@sxs wrote:

if (err == NoError) uv.push_back({ resultUV.u / xSize, resultUV.v / ySize });

It can work.

@sxs wrote:
It seems that the following actions need to be taken.But the xSize/ySize I get can not produce the correct effect.

The reason is that the texture is missing.