# 4 - GC-3 Pictorials Illustrating 3D Objects Pictorials...

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Illustrating 3D Objects - Pictorials GC-3 Pictorials

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Sketch pictorials of an object (either oblique or isometric) given orthographic views of the object. Select the best orientation of an object shown in pictorial. Define what makes a drawing a: cavalier oblique, cabinet oblique, general oblique, isometric, axonometric, perspective, or orthographic views.
If Orthographic projections use two-dimensional views to represent the object, Pictorials show all three directions (axis) of space in one picture, much as they would be captured by a camera. In Parallel Projections, any lines that are parallel on the object will be parallel on the projected views. Perspective Projections reproduce the effect that distant objects appear smaller than nearer objects. Lines which are parallel in nature appear to converge towards a single point.

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A three dimensional pictorial is a drawing that shows an object’s three principal planes, much as they would be captured by a camera Sometimes they are called Technical Illustrations
1. Oblique a) General b) Cavalier c) Cabinet 2. Axonometric a) Isometric b) Dimetric c) Trimetric 3. Perspective a) One point b) Two point c) Three point Three types with three sub-types each.

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Oblique drawings are a type of parallel projections where the most descriptive face of the object is projected parallel to the projection plane, thus appearing true size, and depth is represented using angled, parallel lines drawn to one side of the front face.

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