static void ProgressBarAt(float percent, Vec3 topLeftCorner, Vec2 size)

This is a simple horizontal progress indicator bar. This is used by the HSlider to draw the slider bar beneath the interactive element. Does not include any text or label.

float percent A value between 0 and 1 indicating progress from 0% to 100%.
Vec3 topLeftCorner This is the top left corner of the UI element relative to the current Hierarchy.
Vec2 size The layout size for this element in Hierarchy space. If an axis is left as zero, it will be auto-calculated. For X this is the remaining width of the current layout, and for Y this is UI.LineHeight.

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