The 3D graphic on the right shows a table tennis table - Leaving Cert DCG - Question B-2 - 2012
Question B-2
The 3D graphic on the right shows a table tennis table.
Fig. B-2 below shows the plan and elevation of a model of the table and net.
(a) Draw the given plan.
(b) M... show full transcript
Worked Solution & Example Answer:The 3D graphic on the right shows a table tennis table - Leaving Cert DCG - Question B-2 - 2012
Step 1
Draw the given plan.
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Answer
To draw the plan of the table tennis table:
Identify the dimensions and shape from the elevation diagram in Fig. B-2.
Start by sketching the rectangle representing the top of the table. The overall length is 150mm and width is 65mm. Mark the corners clearly as A and Y for reference.
Indicate the positions for any thickness of the sides as needed, ensuring the correct scale of 1:1 is kept.
Add markings for the sections and edges as per the plan.
Label all relevant parts and ensure the orientation matches the perspective to prevent confusion.
Step 2
Plan of spectator, PP, VP1, and VP2.
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To create the plan view from the spectator’s point:
Position the spectator point at 70mm from corner A as specified.
Draw the picture plane (PP) parallel to the nearest edge of the table.
Mark the vertical planes (VP1 and VP2) perpendicular to the picture plane at appropriate measures.
Step 3
Elevation of GL, HL, VP1, and VP2.
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For the elevation:
Draw the ground line (GL).
Establish the horizon line (HL) 80mm above the GL.
Mark the vertical position of VP1 and VP2 accordingly, ensuring they align with the perspective angle.
Step 4
Sight lines from spectator to plan.
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To indicate sight lines:
Draw lines from the spectator point to key reference points on the table in the plan.
Ensure these lines determine the visual relationship to the picture plane.
Step 5
Perspective of bottom edges.
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For the perspective drawing of bottom edges:
Use the ground line as a reference to draw the bottom perspectives of the table edges.
Adjust angles based on the viewer's sight line.
Step 6
Establish height for the table.
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To establish height:
Set the height of the table edges based on the reference in the elevation; standard height could be between 76cm (760mm) for table tennis, make appropriate adjustments to meet scale.
Step 7
Perspective of table body.
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For the perspective of the table body:
Use existing measurements to create a three-dimensional representation of the table.
Ensure correct vanishing points are maintained for accurate depth.
Step 8
Establish heights for the V section (h1 and h2).
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To establish the heights for section V:
Measure from the ground line; let h1 be the height from the lowest edge to the horizon post elevation reference, while h2 should be the corresponding height to the upper edge.
Step 9
Perspective of V section.
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To draw the perspective of the V section:
Show the angles of the slanting sides leading to the specified heights both visually and dimensionally.
Step 10
Perspective of net.
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For the net:
Depict the net as a horizontal line at the specified height, drawing it across the width of the table, ensuring it ties into the perspective created for the table body.
Step 11
Presentation.
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To present the drawings:
Ensure all drawings are neat, labeled correctly, and included the required dimensions for clarity.
Use consistent line weights, shade appropriately for depth, and check all angles for accuracy.
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