Can someone explain

[Awuah29]

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Hey guys,
can someone explain or better post an example for the following rule for the Top Front and Endview

Rules from Barron's PAT

"Any deviation from the parallel viewing plane results in a visible line at the point where the transition from the parallel to angular takes place . Creases in the form that are visible from the projection view result in solid lines."😱

Anyone has a perfect example where this rule applies. Please feel free to post one example where this rule applies. I don't understand this rule.

Thanks

 

[Awuah29]

anyone??🙁

 

[RING12]

anyone??🙁

go with dash, solid lines it's easier. i do not have time to explain it right now, but i will draw it on a paper then i will posted to you or if you have e-mail address i can just attach the file with explanation and send it to you. i will do it tonight.

 

[Drill2Fill]

Probably would be easier if you could take a peek into a kaplan lecture book, then for someone to explain it on here.

 

[Awuah29]

Probably would be easier if you could take a peek into a kaplan lecture book, then for someone to explain it on here.

come on man! we are here to help each other and i am thankful for any help. i tried using the kaplan, but don't understansd the mentioned above rule. Thanks Ring will be waiting for your post or e-mail me .

 

[Streetwolf]

"Any deviation from the parallel viewing plane results in a visible line at the point where the transition from the parallel to angular takes place."

Basically it says this: If you look at the figure from the given perspective (top, front, or right end), you might see faces that are exactly parallel to that perspective. An example would be if there is a cube you are looking at which is directly in front of you and not on any angle. You would ONLY see the side which faces you (it would look like a [2D] square). That side would be parallel to your perspective. So would the opposite face. All the other four sides would be perpendicular to your perspective.

If you have one of these parallel 'areas' on the figure and at some point it 'branches off' (deviates) from being parallel - such as any of the other four faces of the cube above - you will see the edge. There will be a line. In the cube example, you would only see a square. But all four sides of the square are where there's a transition from parallel face to 'angular' face (angular = not parallel). So you see a line representing an edge.


"Creases in the form that are visible from the projection view result in solid lines."

Solid line = edge that you can see from your perspective. If you had a cube that is angled by 45 degrees from your perspective, the shape you'd see would be a rectangle. The length would be the same as from one corner of a face to the opposite corner (why?). The width would be the same as the edge (why?). But you would see a solid line in the dead center of the rectangle. It would be vertical and would cut the rectangle into two equal pieces. This is the edge of the cube. You can see it from where you are viewing the cube.

If you have a figure with an edge you CANNOT see (it's on the opposite side), the line would be dashed and not solid.

 

[Awuah29]

thanks streetwolf for the explanation ! awesome!!!👍