Differential D20146 Diff 55204 general_concepts/projection/perspective.rst

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general_concepts/projection/perspective.rst

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33	.. image:: /images/en/category_projection/projection-cube_12.svg	33	.. image:: /images/en/category_projection/projection-cube_12.svg
34	:align: center	34	:align: center
35		35
36	That went pretty well. As you can see we sorta ‘merged’ the two sides into one (resulting into the purple side square) so we had an easier time projecting. The projection is limited to one or two vanishing point type projection, so only the horizontal lines get distorted. We can also distort the vertical lines	36	That went pretty well. As you can see we sorta ‘merged’ the two sides into one (resulting into the purple side square) so we had an easier time projecting. The projection is limited to one or two vanishing point type projection, so only the horizontal lines get distorted. We can also distort the vertical lines
37		37
38	.. image:: /images/en/category_projection/projection-cube_13.svg	38	.. image:: /images/en/category_projection/projection-cube_13.svg
39	:align: center	39	:align: center
40		40
41	… to get three-point projection, but this is a bit much.(And I totally made a mistake in there…)	41	… to get three-point projection, but this is a bit much. (And I totally made a mistake in there…)
42		42
43	Let’s setup our perspective projection again…	43	Let’s setup our perspective projection again…
44		44
45	.. image:: /images/en/category_projection/projection_image_31.png	45	.. image:: /images/en/category_projection/projection_image_31.png
46	:align: center	46	:align: center
47		47
48	We’ll be using a single vanishing point for our focal point. A guide line will be there for the projection plane, and we’re setting up horizontal and vertical parallel rules to easily draw the straight lines from the view plane to where they intersect.	48	We’ll be using a single vanishing point for our focal point. A guide line will be there for the projection plane, and we’re setting up horizontal and vertical parallel rules to easily draw the straight lines from the view plane to where they intersect.
49		49
50	And now the workflow in gif-format…(don’t forget you can rotate the canvas with 4 and 6)	50	And now the workflow in gif-format… (don’t forget you can rotate the canvas with :kbd:`4` and :kbd:`6`)
51		51
52	.. image:: /images/en/category_projection/projection_animation_03.gif	52	.. image:: /images/en/category_projection/projection_animation_03.gif
53	:align: center	53	:align: center
54		54
55	Result:	55	Result:
56		56
57	.. image:: /images/en/category_projection/projection_image_32.png	57	.. image:: /images/en/category_projection/projection_image_32.png
58	:align: center	58	:align: center
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70		70
71	The ortho graphics are being set to 45 and 135 degrees respectively.	71	The ortho graphics are being set to 45 and 135 degrees respectively.
72		72
73	We draw horizontal lines on the originals, so that we can align vanishing point rulers to them.	73	We draw horizontal lines on the originals, so that we can align vanishing point rulers to them.
74		74
75	.. image:: /images/en/category_projection/projection_image_34.png	75	.. image:: /images/en/category_projection/projection_image_34.png
76	:align: center	76	:align: center
77		77
78	And from this, like with the shearing method, we start drawing.(don’t forget the top-views!)	78	And from this, like with the shearing method, we start drawing. (Don’t forget the top-views!)
79		79
80	Which should get you something like this:	80	Which should get you something like this:
81		81
82	.. image:: /images/en/category_projection/projection_image_35.png	82	.. image:: /images/en/category_projection/projection_image_35.png
83	:align: center	83	:align: center
84		84
85	But again, the regular method is actually a bit easier...	85	But again, the regular method is actually a bit easier...
86		86
87	But now you might be thinking: gee, this is a lot of work… Can’t we make it easier with the computer somehow?	87	But now you might be thinking: gee, this is a lot of work… Can’t we make it easier with the computer somehow?
88		88
89	Uhm, yes, that’s more or less why people spent time on developing 3d graphics technology:	89	Uhm, yes, that’s more or less why people spent time on developing 3d graphics technology:
90		90
91	.. image:: /images/en/category_projection/projection_image_36.png	91	.. image:: /images/en/category_projection/projection_image_36.png
92	:align: center	92	:align: center
93		93
94	.. image:: /images/en/category_projection/projection_image_37.png	94	.. image:: /images/en/category_projection/projection_image_37.png
95	:align: center	95	:align: center
96		96
97	(above sculpted in blender using our orthographic reference)	97	(The image above is sculpted in blender using our orthographic reference)
98		98
99	So let us look at what this technique can be practically used for in the next part...	99	So let us look at what this technique can be practically used for in the next part...