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3:03 PM, Wednesday July 15th 2020

Hi,

I see your intersection on the top is changing directions 3 times, but it should be a strait line. The intersections change direction only when they touch an edge.

To start an intersection, you can choose a place where an edge of cube A enters a face of cube B. Then, you can trace a line parallel to the face of cube B until it touches an edge. Then you find the face you want to continue your intersections on and continue your line parallel to that face.

Here, take a look at my form intersections and isolate to cubes to study them. They are by no way perfect but Uncomfortable said I had a good start : https://imgur.com/a/iG0n4Us

Have fun!

1:53 AM, Thursday July 16th 2020

hey there thanks so much for helping me out!

i did notice my lines change direction too much, so i tried to practice that (no clue if it is correct but)

http://imgur.com/a/Qo476yh

what counts as an edge ? for example im having a lot of trouble on #1 in the image example. if i draw a line where do i stop the line?

2:40 AM, Thursday July 16th 2020

Hi there, you're welcome!

Okay open this image :

http://imgur.com/a/iKizjsO

First, good job for the number 2. Even if those lines touched others, you did well not changing their directions because those lines were delimiting other faces.

For the number 3, you missed an edge. Your intersection touched an edge of the box on the right, which was supposed the make the intersection deviate. There, I put 2 examples of what you could have done. They seem similar because the angle vary only slightly but in one example, the line I point is parallel to the edges of the box on the right and in the other example, the edge of the other box.

For the number 1, I broke my rule of the intersections needing to be parallel. I told you that rule to make things easier at first, but as you progress start breaking it. Honestly, you can redo that same example in many different ways. If the box on the right was totally behind the one on the left, there would have been no intersections. if the one on the left was slightly behind the one on the right, the intersections would have been totally different. It is about imagining which box is over which box, then trying to see how the faces would touch each other. Try different intersections with the same example :

  1. The left box really in front of the right one, but still touching.

  2. The right box really in front of the left one, but still touching.

  3. Left box slightly in front of the right one.

  4. The right box slightly in front of the left one.

It will be hard but since you're attacking your weakness, I am sure it will do wonders to your capacity of visualizing 3D space!

Keep up the good work!

4:56 PM, Thursday July 16th 2020
edited at 4:57 PM, Jul 16th 2020

thanks!

i tried to practice again do you think these look correct? http://imgur.com/a/RJLe1m8

(sorry for the blurry pic it seems my file got messed up a bit but hopefully u can see)

edited at 4:57 PM, Jul 16th 2020
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