multi-view sketching. learning objectives understand using the ‘glass box’ to help define...
DESCRIPTION
Multi-View Drawing Shows two or more two-dimensional views of a three-dimensional object. Provides the shape description of an object. When combined with dimensions, serves as the main form of communication between designers and manufacturers.TRANSCRIPT
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Multi-View Sketching
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Learning Objectives
• Understand using the ‘Glass Box’ to help define orthographic projections.
• Be able to define Multi-View Drawing, Projection Plane, the three dimensions, Orthographic Projection.
• De able to determine if you need one, two or three views
• Be able to create an Orthographic Projection of a 3-D object.
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Multi-View Drawing
• Shows two or more two-dimensional views of a three-dimensional object.
• Provides the shape description of an object.
• When combined with dimensions, serves as the main form of communication between designers and manufacturers.
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Example of Multi-view Sketch
LEFT SIDE RIGHT SIDEFRONT
Dining Chair
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Multi-View Drawing
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Multi-View Drawing
All three-dimensional objects have width, height, and depth.
– Width is associated with an object’s side-to-side dimension.
– Height is associated with an object’s top-to-bottom dimension.
– Depth is associated with front-to-back distance.
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Multi-View Drawing
TOP VIEW
FRONT VIEW RIGHT SIDE VIEW
A typical multi-view drawing includes a top view, a front view and a right side view.
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45°
Multi-View Drawing
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Orthographic Projection
• A technique used to create Multi-View drawings.
• Any projection of the features of an object onto an imaginary plane of projection. – The projection of the features of the object is
made by lines of sight that are perpendicular to the plane of the feature
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The best way to understand orthographic projection is to imagine an object contained inside a glass box.
Orthographic Projection
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There is a total of six glass walls surrounding the object. Each wall represents a projection plane onto which a two- dimensional object view will be created.
Orthographic Projection
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Also referred to as a plane of projection or picture plane, is an imaginary surface that exists between the viewer and the object.The surface onto which a two-dimensional view of a three-dimensional object is projected and created.
Projection Plane
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Start by focusing only on the front projection plane.A person standing in front of the object would see only the five corners identified in black.
1
2
3
4
5line of sight
at 90° angle
to projection
plane
Orthographic Projection
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Projection lines are used to project each corner outward until they reach the projection plane.
Orthographic Projection
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The visible edges of the object are then identified on the projection plane by connecting the projected corners with object lines.
Orthographic Projection
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Checking for Understanding
• Go to http://faculty.gvsu.edu/karpenm/melissa/glassboxindex.html
• Run through Demonstration of Principles with class
• Individually complete Orthographic Projection Tutorial
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The Glass Box: 10 MinutesOrthographic Projection Tutorial2) Select
Orthographic Projection Tutorial 3) Experiment
with Demo Mode
4) Complete the levels and the Timed Activities.
http://faculty.gvsu.edu/karpenm/melissa/glassboxindex.html
1) Use the ‘GlassBox’
hyperlink that is on the
class website.
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The orthographic projection process is then repeated on the other projection planes.
Orthographic Projection
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Orthographic View Selection
Recommendations for how to select the front view
– Most natural position or use– Shows best shape and characteristic contours– Longest dimensions– Fewest hidden lines– Most stable and natural position
Noteworthy
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Orthographic View Selection
BEST FRONT VIEW
Best shapeDescription
Longest Dimension
Most natural position
No hidden edges
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Number of Orthographic Projections
One View•Uniform thickness or shape•Two views would be identical•All dimensions properly and easily shown on one view
Noteworthy
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Number of Orthographic Projections
Two Views•Symmetrical part•A third view would be identical to one other•Second view is necessary for depth
Noteworthy
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Given the overall dimensions of the object, a pencil, and a sheet of graph paper, a sketching multi-view drawing can be easily done using points, construction lines, and object lines.
Sketching a Multi-View Drawing
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Sketching a Multi-View DrawingStep 1 - Boundary Box: Layout the boxes within
which the individual views will occur using points and construction lines.
FRONT
TOP
RIGHT SIDE
Noteworthy
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Sketching a Multi-View DrawingStep 2 - Faces: Use construction lines between the
views to indicate the geometry of the views.
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Sketching a Multi-View DrawingStep 3 – Faces/Inside: Identify the visible edges with
Object lines.
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Sketching a Multi-View DrawingStep 4 - Inside: Locate hidden lines.
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Leonard P. Karr (1913-1995) designed a man-sized hunting blind shaped like a goose called Super Goose, 1991.
Historical Example
• How would you label the views presented in the drawing?
• Are Mr. Karr’s views properly aligned based on the orientation presented here?
• How would you rearrange the views to orient
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A Question…
Each of the blocks at right has the same overall dimensions and color. What else do they have in common?
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A Question…
Each of the blocks at right has the same overall dimensions and color. What else do they have in common?
They all have identical top
views!
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Practice on Problem 24: Page 14
Recall this is a ¼” GridStep 1 - Boundary Box: Layout the boundary boxes within which the individual views will occur using points and construction lines.Step 2 - Faces/Inside: Use construction lines between the views to indicate the geometry of the viewsStep 3 - Faces/Inside: Identify the visible edges with Object linesStep 4 - Locate hidden lines
In your 2D Sketchbook complete problems 25 – 32USE YOUR STRAIGHT EDGE!!Don’t erase construction lines.
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Activity
• Complete Drawings 25 – 32.• Start with Baseline one grid (1/4”) up from
bottom.• Left vertical line one grid in from left• Make boundary box leaving ¼” between
front and top view and ¼” between front and right view.
• …