All three faces and axes make different angles with the plane of projection. A Trimetric projection is created using 3 axes where each of the angles between them is different (there are no equal angles) In trimetric pictorials, the direction of viewing is such that all of the three axes of space appear unequally foreshortened. The scale along each of the three axes and the angles among them are determined separately as dictated by the angle of viewing. Approximations in Trimetric drawings are common.
Trimetric are essentially the same as diametric drawings because the base of the object is a plan. The only difference is that the base is rotated at a 30° – 60 ° angle rather than a 45° – 45° angle. Other angles are possible for both diametric and trimetric drawings but are more difficult to construct. For both these drawings the heights are determined using either measured or projected. Vertical lines are drawn vertically for all axonometric drawings. Horizontal lines parallel in the object remain so in the drawing.
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