MULTIVIEW PROJECTION
 
Multiview projection is an orthographic projection for which the object is behind the plane of projection, and the object is oriented such that only two of its dimenstions are shown.
 

Frontal Plane of Projection

The front view of an object shows the width and height dimensions. The front view is the projected on the frontal plane of projection
 

Horizontal Plane of Projection

The top view of an object shows the width and depth dimensions. The top view is projected onto the horizontal plane of projection.
 

Profile Plane of Projection

The side view of an object shows the depth and height dimensions. The rightside view is the standrard side view used. The right side view is projected onto the right plane of projection.
 

Arrangement of Views
 

Creating Three View Sketches: Steps

Step 1:
Begin by blocking in the front, top and rightside views of the object, using the overall width, height, and depth. Sketch the front view first, then use construction lines to project the width dimention to the top view from the front view. Use construction lines to project the height dimension from the front view to the right view. Leave room between the views. Make sure the depth dimension is equal in the top and rightside views.
 

Step 2:
Lightly block in the major features seen in each view.
 

Step 3:
Identify location and size of features in other views. Use construction lines to project location and size of a feature from one view to another. The depth dimension can be shared between the top and right side view using a miter line.
 

Step 4:
Finish adding the rest of the final lines. Be careful to do all hidden lines and center lines for holes. Darken all final lines.

 

ISOMETRIC SKETCH
 
An isometric sketch is a type of parallel projection that represents all three dimensions in a single image. Isometric sketches have a standard orientation that makes them particularly easy to sketch.
 

Creating Isometric Sketches: Steps

Step 1:
Isometric sketches begin with defining an isometric axis, which is made of three lines, one vertical and two drawn at 30 degrees from the horizontal. These three lines of the isometric axis represent the three primary dimensions of the object: width, height, and depth.
 

Step 2:
Begin the sketch by extending the isometric axes and then mark width, height and depth on the appropriate axes.
 

Step 3:
Draw the font face of the isometric block.
 

Step 4:
Draw the isometric block.
 

Step 5 & 6:
Add details to the block starting from the front face. Then add details to the other faces. Darken all visible lines to complete the isometric sketch. (make sure that construction lines are light)