Scratch

illusionist · 2010-01-28 19:10:28

NASA wrote:
If a light is shone on a three dimensional object, a two-dimensional shadow is cast. By dimensional analogy, light shone on a two-dimensional object in a two-dimensional world would cast a one-dimensional shadow, and light on a one-dimensional object in a one-dimensional world would cast a zero-dimensional shadow, that is, a point of non-light. Going the other way, one may infer that light shone on a four-dimensional object in a four-dimensional world would cast a three-dimensional shadow.

What could cast a 3D shadow? Discuss.

Here is a Tesseract

Last edited by illusionist (2010-01-28 20:00:23)

Mr_X · 2010-01-28 19:12:31

Speak english

illusionist · 2010-01-28 19:13:36

Mr_X wrote:
Speak english

Learn to understand english.

littletonkslover · 2010-01-28 19:14:33

lawls

Kileymeister · 2010-01-28 19:15:32

Well, the fourth dimension is technically all of the points between an object and where the object will be, basically in time. So you need the object, where it will be, and light reflecting off all of those points, and that might make 3D or something. I don't really know.

Mr_X · 2010-01-28 19:15:41

illusionist wrote:
Mr_X wrote:
Speak english
Learn to understand english.

No you

Explain this better because no one will get it

Going the other way, one may infer that light shone on a four-dimensional object in a four-dimensional world would cast a three-dimensional shadow.

adriangl · 2010-01-28 19:16:04

Complicated, but now I get it. Pretty cool!

illusionist · 2010-01-28 19:17:04

Mr_X wrote:
illusionist wrote:
Mr_X wrote:
Speak english
Learn to understand english.
No you

Explain this better because no one will get it
Going the other way, one may infer that light shone on a four-dimensional object in a four-dimensional world would cast a three-dimensional shadow.

YOU obviously don't get it. lol

Go get a dictionary if you don't know what a word means. lol

Lucario621 · 2010-01-28 19:17:16

What makes you say a 3d object casts a 2d shadow? If the shadow is on a step of a staircase for example, that shadow is 3D along the entire sides of the staircase.

Ace-of-Spades · 2010-01-28 19:17:35

The 4th dimension is time travelling. If you think you understand this stuff, you're wrong.

Mr_X · 2010-01-28 19:17:45

No, I get every word
It's just that a shadow can't be 3D or it's not a shadow

steppenwulf · 2010-01-28 19:18:50

Isn't the fouth dimention have to do with time? You can't shine a light on time.

illusionist · 2010-01-28 19:18:56

Lucario621 wrote:
What makes you say a 3d object casts a 2d shadow? If the shadow is on a step of a staircase for example, that shadow is 3D along the entire sides of the staircase.

Textures are always 2D. Even if it is "bent" in 3D space, a texture is always perfectly flat. It is only applied to a 3D form, but It remains as a 2D texture.

Shadows are always flat. A 4D/3D shadow would take the form of a "cube" for example.

Last edited by illusionist (2010-01-28 19:19:51)

Kileymeister · 2010-01-28 19:20:42

Ace-of-Spades wrote:
The 4th dimension is time travelling.

No, it is EVERY point between where an object is and where it will be. Lot's of points to shine a light on...

Lucario621 · 2010-01-28 19:21:24

illusionist wrote:
Lucario621 wrote:
What makes you say a 3d object casts a 2d shadow? If the shadow is on a step of a staircase for example, that shadow is 3D along the entire sides of the staircase.
Textures are always 2D. Even if it is "bent" in 3D space, a texture is always perfectly flat. It is only applied to a 3D form, but It remains as a 2D texture.

Shadows are always flat. A 4D/3D shadow would take the form of a "cube" for example.

Yeah, I see you're point.

Lucario621 · 2010-01-28 19:22:50

Kileymeister wrote:
Ace-of-Spades wrote:
The 4th dimension is time travelling.
No, it is EVERY point between where an object is and where it will be. Lot's of points to shine a light on...

No, the 4th dimension is time. Not time traveling, not every point or anything, but just time.

illusionist · 2010-01-28 19:23:28

Ace-of-Spades wrote:
The 4th dimension is time travelling. If you think you understand this stuff, you're wrong.

You would be wrong too! lol

It is the duration of space. Correct, but there is still much more to it than that.

Ace-of-Spades · 2010-01-28 19:27:00

Kileymeister wrote:
Ace-of-Spades wrote:
The 4th dimension is time travelling.
No, it is EVERY point between where an object is and where it will be. Lot's of points to shine a light on...

Duh. That's time travelling.

Greatdane · 2010-01-28 19:27:39

Mr_X wrote:
No, I get every word
It's just that a shadow can't be 3D or it's not a shadow

How do you know, smartypants?

Ace-Of-Spades wrote:
The 4th dimension is time travelling.

Look above.

Illusionist, very interesting, although I knew that last year. tongue

I can actually explain a theory I made on time travel if you want... tongue

Kileymeister · 2010-01-28 19:28:19

Lucario621 wrote:
Kileymeister wrote:
Ace-of-Spades wrote:
The 4th dimension is time travelling.
No, it is EVERY point between where an object is and where it will be. Lot's of points to shine a light on...
No, the 4th dimension is time.

Time. i.e. the motion of all objects. i.e. every point an object passes through to get to where it will be, i.e. what I said.

So, basically I said time, just in a smart way tongue

Last edited by Kileymeister (2010-01-28 19:28:35)

illusionist · 2010-01-28 19:28:30

Ace-of-Spades wrote:
Kileymeister wrote:
Ace-of-Spades wrote:
The 4th dimension is time travelling.
No, it is EVERY point between where an object is and where it will be. Lot's of points to shine a light on...
Duh. That's time travelling.

You seem to have worked up quite an attitude lately. hmm

If you don't have anything polite to say, then done say anything at all.

___________________

Discuss the 4th dimension.

RHY3756547 · 2010-01-28 19:28:33

The simple explanation:

There is no 4th dimension. People made it up. tongue

Lucario621 · 2010-01-28 19:29:13

Look at these two videos, explaining the dimensions.

http://www.scratch.mit.edu/ext/youtube/?v=JkxieS-6WuA

http://www.scratch.mit.edu/ext/youtube/?v=ySBaYMESb8o

illusionist · 2010-01-28 19:29:50

RHY3756547 wrote:
The simple explanation:

There is no 4th dimension. People made it up.

2D creatures have no reason to believe in the 3rd dimension if what you say is true. tongue

RHY3756547 · 2010-01-28 19:31:03

illusionist wrote:
RHY3756547 wrote:
The simple explanation:

There is no 4th dimension. People made it up.
2D creatures have no reason to believe in the 3rd dimension if what you say is true.

Indeed.

Scratch

archived forums

#1 2010-01-28 19:10:28

The Fourth Dimiension

NASA wrote:

#2 2010-01-28 19:12:31

Re: The Fourth Dimiension

#3 2010-01-28 19:13:36

Re: The Fourth Dimiension

Mr_X wrote:

#4 2010-01-28 19:14:33

Re: The Fourth Dimiension

#5 2010-01-28 19:15:32

Re: The Fourth Dimiension

#6 2010-01-28 19:15:41

Re: The Fourth Dimiension

illusionist wrote:

Mr_X wrote:

#7 2010-01-28 19:16:04

Re: The Fourth Dimiension

#8 2010-01-28 19:17:04

Re: The Fourth Dimiension

Mr_X wrote:

illusionist wrote:

Mr_X wrote:

#9 2010-01-28 19:17:16

Re: The Fourth Dimiension

#10 2010-01-28 19:17:35

Re: The Fourth Dimiension

#11 2010-01-28 19:17:45

Re: The Fourth Dimiension

#12 2010-01-28 19:18:50

Re: The Fourth Dimiension

#13 2010-01-28 19:18:56

Re: The Fourth Dimiension

Lucario621 wrote:

#14 2010-01-28 19:20:42

Re: The Fourth Dimiension

Ace-of-Spades wrote:

#15 2010-01-28 19:21:24

Re: The Fourth Dimiension

illusionist wrote:

Lucario621 wrote:

#16 2010-01-28 19:22:50

Re: The Fourth Dimiension

Kileymeister wrote:

Ace-of-Spades wrote:

#17 2010-01-28 19:23:28

Re: The Fourth Dimiension

Ace-of-Spades wrote:

#18 2010-01-28 19:27:00

Re: The Fourth Dimiension

Kileymeister wrote:

Ace-of-Spades wrote:

#19 2010-01-28 19:27:39

Re: The Fourth Dimiension

Mr_X wrote:

Ace-Of-Spades wrote:

#20 2010-01-28 19:28:19

Re: The Fourth Dimiension

Lucario621 wrote:

Kileymeister wrote:

Ace-of-Spades wrote:

#21 2010-01-28 19:28:30

Re: The Fourth Dimiension

Ace-of-Spades wrote:

Kileymeister wrote:

Ace-of-Spades wrote:

#22 2010-01-28 19:28:33

Re: The Fourth Dimiension

#23 2010-01-28 19:29:13

Re: The Fourth Dimiension

#24 2010-01-28 19:29:50

Re: The Fourth Dimiension

RHY3756547 wrote:

#25 2010-01-28 19:31:03

Re: The Fourth Dimiension

illusionist wrote:

RHY3756547 wrote:

Board footer