How to: Use custom shader to change color of and position of edges

Visualization Solutions HOOPS Visualize Desktop
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Below is sample code that uses custom shaders to change color and make a small shift on position of edges. This code was tested on HPS 2025.7.0.

Screenshot:

Snag_20570fc2
Snag_20570fc21422×830 14.6 KB

Sample code:

void CHPSView::OnUserCode2()
{
    

	// drawing test, simple shaders change color or position

	static char const ps_source[] = { "void custom_main(inout PixelShaderContext ctx) { \n"
									 "\tctx.poutput.FinalColor = float4(0.0, 1.0, 0.0, 0.0);\n"
									 "}\n\n" };
	static char const vs_source[] = { "void custom_main(inout VertexShaderContext ctx) { \n"
									 "\tctx.voutput.position.x += 0.5f;\n"
									 "\tctx.voutput.position.y += 0.1f;\n"
									 "}\n\n" };

	PixelShaderKit real_psk;
	real_psk.SetSource(ps_source);
	PixelShaderKey real_ps = Database::DefinePixelShader();
	real_ps.Set(real_psk);

	VertexShaderKit real_vsk;
	real_vsk.SetSource(vs_source);
	VertexShaderKey real_vs = Database::DefineVertexShader();
	real_vs.Set(real_vsk);

	Point points[] = { Point(-0.5f, -0.5f, 0), Point(0.5f, -0.5f, 0), Point(0.5f, 0.5f, 0), Point(-0.5f, 0.5f, 0) };
	int facelist[] = { 4, 0, 1, 2, 3 };

	SegmentKey geometry = Database::CreateRootSegment();
	geometry.GetVisibilityControl().SetEdges(true);
	geometry.InsertShell(4, points, 5, facelist);
	IncludeKey include = GetCanvas().GetFrontView().GetAttachedModel().GetSegmentKey().IncludeSegment(geometry);

	geometry.SetPixelShader(real_ps, Shader::Primitives::Lines);
	geometry.SetVertexShader(real_vs, Shader::Primitives::Lines);


    GetCanvas().UpdateWithNotifier().Wait();

}