Converted with 21.2 version on windows 10 shapes are there, but no colors:
using (var viewer = new Viewer("sample.Dwg"))
{
var options = HtmlViewOptions.ForEmbeddedResources("p1.html");
viewer.View(options, 1);
…...Dwg to HTML rendering lacks colors in .NET GroupDocs.Viewer Product...Product Family dotnet , dwg-to-html , document-rend eugenekr...