when looking through the camera lens
Notice the two strips of masking tape placed down each side of the camera
viewing window on the camera. These have been marked out with with lines equal
in measurement. Using these measurements down the side of the viewing window of
the camera, helped me to draw the grid. Using them as guides to see where to put
the marks on the papers drawing surface. This was only necessary for the
horizontal lines of the grid. The vertical lines can be measured after you have
drawn the horizontal lines. This can be done by dividing the top and bottom
lines by ten as in this example but this will depend on how many squares you
want in your 3d drawing grid. The more squares you have in your grid to make 3d
drawings. The easier it will be to complete your end drawing.
The secret of 3d drawings using a camera technique like the preferred choice
of street artists.
In the image below you can see what the reference grid actually looks like
when viewed from the front as you would normally. Please take notice of how the
grid is wider at the top than the bottom. Also notice how the squares have
become elongated and the horizontal lines are further apart as they get closer
to the top of the paper. This image below shows what a perspective 3d drawing
grid might look like if it was being used to draw an object, such as a building
being viewed from above.

Anamorphic perspective grid for doing 3d drawings viewed directly from the
front.
In the next image below I have drawn the Clipper lighter using the
perspective grid for 3d drawings as a guide to accurately draw the lighter at
this distorted perspective. Also notice how it can be seen in the camera viewing
window. Notice how when looking at it through the camera viewing window it can
be seen as a Clipper lighter standing up right and how the drawing grid also
seems to be made up of squares.

3d drawing of the lighter through the camera lens, this is showing the
lighter and reference grid at the correct viewing plane for comparison .
The image below is a photograph of the 3d drawing, showing further how it
looks just like any other drawing of a lighter standing upright. This gives you
a visual demonstration of the optical illusion created by the anamorphic 3d
drawings perspective and the focal plane of the camera.

Anamorphic perspective drawing at the correct photographic angle and
position as photographed with the camera.

The next image has been photographed slightly out of position and not at the
correct focal plane. This enables you to be more able to see what it looks like
in reality. It is revealing the distorted 3d drawing showing how it is much
bigger at its furthest point from the viewing position.

Anamorphic Perspective drawing lying on drawing table showing its two
dimensional attributes because the camera is not correctly sited.
Below you will find two more images to show what this drawing really looks
like, when viewed as you would normally, the first one is the right way round
and the second is being viewed, the wrong way round. Taking a look at these
gives a better understanding of what the secret really looks like and helped me
to visualize the distortion created by this unusual illusionary effect in the
technique of making 3d drawings.
This image below is being shown the correct way up and is viewed from the
front as you would any other drawing or image, directly from the front. It
clearly shows how the drawing is distorted with the top being much wider than
the bottom.

The 3d drawing of the lighter as viewed directly from the front showing it
as it would be viewed when not looking at the correct angle.
The image below has been turned up side down and reveals that looking at it
this way around presents an image that resembles a perspective grid for
depicting something that is tapering off into the distance. This is because that
is what it is and would be doing. If something is close it will be big and as it
gets further away it will get smaller, and smaller, the further into the
distance it gets.

The same 3d Anamorphic drawing from the front but turned upside down it
gives the impression of any normal perspective drawing, creating the illusion of
distance.
These 3d drawings can be created on a computer using GIMP photo editing
software or any other photo editing software if you can distort images with a
perspective tool. I found that if I took an image and placed a reference grid
over the top of it on a separate layer in GIMP. Then merged both layers together
and distorted it with the bottom being half as wide as the top, it created a
good example of a drawing grid and picture combined. It produced an image that
could be viewed with a camera to make it look like a normal image as shown in
the example below.

Wow, thank you very much can get more tutorials, sincere advice

你好，请问这个教材来自哪里捏，其实原理大概我都理解了，只是画画方面我也不大有基础，所以请教一下哈，就绘制网格的时候反透视那个每一行的缩短的距离有什么方法木有，还有再请教一下上面的是相机还是透视仪啥的呀，谢谢！！！

英文

呵呵你还秀起英语来了

讲的很详细，不过最好要中文同步，谢谢

小伙伴们在哪里~

唉 这贴好玩儿