Question

How do I change the transparency of a polygon? I want to be able to see the map under a polygon.

Answer 1

Lines, polygons and models in Altus all have the ability to be transparent, with the degree of transparency or opacity set with the alpha channel. There is also a way to set the transparency of a whole map layer.

To make a single polygon transparent you can set the alpha color value to something less than 255: 

var colors3 = [new AltusUnified.Color(100, 200, 80, 99), new AltusUnified.Color(10, 100, 80, 99), new AltusUnified.Color(10, 100, 100, 99)]; 

var polygonStyle = new AltusUnified.PolygonStyle(colors3[0], colors3[1], 8, colors3[2], 2);

The value 99 is the alpha value. 0 is completely transparent (invisible). 255 is completely opaque.