What is meant by a Perspective view ?
It is a realistic view in which the objects in front of us tend to appear bigger and the objects away from us tend to appear smaller . In our day today life we see each and every objects in perspective view because our eye is a typical camera with a focal length of 50mm. Because of this such view are proffered in Civil , Architectural ,interior and product presentations because a layman can easy interpret and understand such types of views .
In this post I would like to share with you the method to generate realistic perspectives using AutoCAD software . But users tend to stick to the following conventional methods to create perspective views :
Conventional Methods : 1. Right Click on the view cube and click on the perspective option to change the view from a parallel projection to perspective projection .
2. Left Click on the view controls menu at the upper left corner of the screen and choose perspective option to change the view to a perspective view
3. Left click on the Orbit icon on the navigation bar , right click on the screen and Choose the perspective option to change the view.
Once we are in the perspective view we can orbit the view (using the orbit command or by using the orbit icon or by pressing the CTRL – SCROLL wheel of the mouse ) to adjust our view . But non of these methods will give us a predictable perspective view . Now lets analyse the classifications of perspective views .
Classification of Perspective views : Perspective views are categorised based on the number of vanishing or vantage points . A vanishing point is an imaginary point of intersection when you draw lines from the edges of objects . Depending on the number of vanishing points perspectives are classified as single point , two point and three point perspectives . The following picture shows how the vanishing point is obtained .
In AutoCAD if you want to create such types of predictable and accurate perspective views we have to give DVIEW (Dynamic view) Command . Here are the steps :
1. Keep the UCS X-Y plain at the ground level (using 3 point or origin option of UCS command )
2. Go to plan or top view using view controls menu at the upper left comer of the screen or by clicking on the drop dwon menu VIEW/ 3D VIEWS / TOP option.
3. Give DVIEW command and select the objects to be viewed.
4. Specify the Target and the Camera points using Point filters . Target point is the point towards which you look at and the Camera point is the point from which you look towards the target . Please refer the video link provided at the end of this post to get the procedure
5. Go to Distance option to get the perspective view.
6. Adjust the focal length of the camera using the Zoom option (when you are in the perspective view)
7. Exit the Dview command by giving an enter and save this view using the View command / New or Save option .
We can create different types of perspectives by defining the Target and Camera points in the following manner .
1. Single point perspective (Linear perspective) : Such perspective views will have a single vanishing point and are obtained by keeping the target and the camera at the same height . The line of site (the imaginary line connecting these two points) should be either horizontal or vertical. These types of perspectives are preferred for interior views.
2. Two point perspective (Angular perspective) : Such perspectives will have two vanishing points and are obtained by keeping the Target and the Camera at the same height . The line of site should be inclined . These types of perspective views are generally used in exterior eye level views .
3. Three point perspective (Oblique perspective) : Such types of perspectives will have three vanishing points and are obtained by keeping the Target and Camera at two different heights . The line of site should be inclined . These types of perspectives are used in Arial views which covers vast area in the aperture of the camera.
Please Click on this video the get a complete narration
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