Engineering Drawing
When positioning this feature of perspective projection, the centerline of the cone of visual rays should be directed toward the approximate center of the object:

Vanishing point
Station point
Ground line
Horizon

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Engineering Drawing
Three dimensional models are often used in the design process to ________.

Help the client select a color for their carpet
Help the client understand the overall design concept
Determine the quantity of brick needed to build the house
Provide the client with a model which they can use to impress their friends

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