Construct 3 r421

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  • Thank you for response!

    I want to mix one/two type of objects on canvas and then look at result color at exact point.

    But as I understand all manipulations mentioned in that section uses: only snapshot of the whole frame and can be called only while it sits inside GPU memory.

    So I can't just draw something and check exact point.

    Or JS example doing same snapshot actions from documentation? And I asking for too much since its somehow becomes "backwards rendering"?

    • Have a look at these 4 expressions: SnapshotRedAt(x, y), SnapshotGreenAt(x, y), SnapshotBlueAt(x, y), SnapshotAlphaAt(x, y). Those expressions combined pick the colour of an exact point.

      • I saw them but they took info from whole frame/layers.

        Can I take snapshot of the frame just for certain objects or layers?

        If not, those expressions will get wrong color.

        For example lets take scene: color sprites with 50% opacity on top of ground image. SnapshotRedAt(x, y) will count RGB of the ground too but only RGB of sprites needed.

        Since I could not sample color directly from layer my idea was to use canvas as way to draw color info there and sample it from there somehow.

        • Paste just the objects you want into the canvas, take the snapshot, then sample the pixels. e.g.

          -> Paste object Sprite with effects

          -> Save snapshot

          -> Wait for previous actions to complete

          -> Log in console: DrawingCanvas.SnapshotRedAt(0, 0) & " " & DrawingCanvas.SnapshotGreenAt(0, 0) & " " & DrawingCanvas.SnapshotBlueAt(0, 0) & " " & DrawingCanvas.SnapshotAlphaAt(0, 0)

          • Oh my, NOW I get it!

            Somehow I thought of 'snapshot canvas' from System actions. Now I see that Drawing Canvas have its own snapshot that does everything I asked for.

            Thank you for your patience!