TFE Bootcamp question

[virtualmaster999]

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Hey everyone! How do you distinguish between B and D?

 

[FeralisExtremum]

The critical (and only) thing distinguishing B from D is the presence of the horizontal solid line on the front piece. Since this is the top view, that would indicate a change in height that would be visible in both the front and end views. But as those views show us, there is no change in height on that piece - it stays even in height throughout the entire object.

 

[virtualmaster999]

The critical (and only) thing distinguishing B from D is the presence of the horizontal solid line on the front piece. Since this is the top view, that would indicate a change in height that would be visible in both the front and end views. But as those views show us, there is no change in height on that piece - it stays even in height throughout the entire object.

Which horizontal line do you mean? I get confused on when you mean a horizontal line indicates a change in height. How do you know which line would change height?


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[FeralisExtremum]

The line the red arrow is pointing at is the horizontal line (notice in choice D it is completely absent). Since it's a solid line from the top view, that means there would have to be a change in vertical height between the "front piece" and the rest of the object it's attached to in the front and end views. Here's an example of how the front and end views would look if B was the right answer:

In the correct answer for the original question - and this can be a bit tricky to tell because from the end view, the sides cover it up - the center part of the object is completely flat on top all the way through.

 

[virtualmaster999]

The line the red arrow is pointing at is the horizontal line (notice in choice D it is completely absent). Since it's a solid line from the top view, that means there would have to be a change in vertical height between the "front piece" and the rest of the object it's attached to in the front and end views. Here's an example of how the front and end views would look if B was the right answer:

In the correct answer for the original question - and this can be a bit tricky to tell because from the end view, the sides cover it up - the center part of the object is completely flat on top all the way through.

Great explanation. One thing though how do you know which line will be the one experiencing the height change? Is it something you have to check, or is it something that applies for every situation?


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[FeralisExtremum]

It can be difficult to tell just from one view which part of the object will be lower or higher relative to the other part (for example in answer choice B, that solid line told you there would be a height change but it doesn't tell you whether the front piece is higher or lower than the rest of the object). To figure that out you'd have to use the information from the other perspectives. So in the front/end views I modified above, after the top view in B showed a solid line, you would look at the front or side view to tell the front piece is shorter than the stuff behind it.

 

[virtualmaster999]

It can be difficult to tell just from one view which part of the object will be lower or higher relative to the other part (for example in answer choice B, that solid line told you there would be a height change but it doesn't tell you whether the front piece is higher or lower than the rest of the object). To figure that out you'd have to use the information from the other perspectives. So in the front/end views I modified above, after the top view in B showed a solid line, you would look at the front or side view to tell the front piece is shorter than the stuff behind it.

Oh ok I see what you mean. So do lines of edges count still for a height perspective change? I guess what's throwing me off is how you knew right away which line was going to have a height change.


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[FeralisExtremum]

The lines on the very outside edges just indicate the shape - but any lines "within" the object indicate height/depth changes.

 

[virtualmaster999]

The lines on the very outside edges just indicate the shape - but any lines "within" the object indicate height/depth changes.

That makes more sense, thanks!


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