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Dima Mykhaylov
19,379 PointsAlpha is the opacity or in other words how transparent the color is. The lower the value the more transparent it will be. So opacity 1 would be the normal color of the rgba and 0.1 opacity would make it very hard to see.
pat barosy
6,759 PointsExactly what Dima said.
Samuel Morgan
2,226 PointsSamuel Morgan
2,226 PointsTo add to this, 1 is considered 100% or 'completely visible'. 0.5 would make it 50% transparent.