The main difference between isometric and oblique sketching/drawing is given here. An oblique sketch focuses more on the front of an object or the face. The isometric sketch focuses on the edge of an object. It is usually drawn at a 45 degree angle to represent the third dimension.
Oblique projection is a simple type of technical drawing of graphical projection used to generate two-dimensional (2D) images of three-dimensional (3D) objects.
The main difference between isometric and oblique sketching/drawing is given here. An oblique sketch focuses more on the front of an object or the face. Isometric sketch focuses on the edge of an object. It is usually drawn at a 45 degree angle to represent the third dimension.
It has the advantage that features of the front face can be drawn exactly as they are, without distortion. The receding faces can be drawn at any angle suitable for illustrating the object’s shape and its features.
Orthographic, from ancient Greek Ορθος: upright, and γραφικος: relating to writing/painting, means that the projection lines meet the projection surface at an angle of 90 degrees, they are orthogonal. Oblique comes from Latin and means that the projection lines do not meet the surface at a 90-degree angle.
What is the difference between a two-dimensional sketch and an isometric sketch? Two-dimensional sketches contain details of the object, while isometric is just the outline.
An orthographic projection is a way of representing a 3D object by using multiple 2D views of the object. Orthographic drawings are also known as multiple views. The most commonly used views are top, front and right.
Generally a view of the object is taken parallel to the plane. The projection lines are drawn at an angle of 45°. This view is similar to orthographic projection. The more detailed side of the object is placed in the direction of the major angular axis.
Definition of oblique drawing
: a projective drawing in which the frontal lines are given in true proportions and relationships and all others at appropriate angles other than 90 degrees without regard to the rules of linear perspective.p>
Angle of Receding Lines
An angle of 45° is often chosen for the Angle of Receding Lines, as this is a quick and easy way to create slanted sketches. You can use graph paper and draw the angled lines through the diagonals of the lattice boxes. An angle of 30° is also a popular choice. It can sometimes look more realistic.
Keystone projection is probably the easiest way to create a pictorial drawing because areas directly in front of the viewer look very similar to the front view in an orthogonal drawing.
Another way of looking at it is that in an orthographic projection the lines of the projection intersect the plane being projected on at a perpendicular angle (hence they are orthogonal, hence the name of the projection), while in an oblique projection these lines form oblique Angles (not right angles) with the projection…
Two commonly used oblique projections are the Cavalier and Cabinet projections. Cavalier projection preserves the lengths of lines perpendicular or parallel to the projection plane, with lines of sight at θ = ϕ = 45 degrees.
All dimensions in the isometric drawing are actual, while in the isometric projection isometric scale must be used. Was this answer helpful?