|Modeling a Hand with Block Modeling
describes how to make a simple hand. It uses the ever popular technique
The basic idea is to start with a cube divided into a small number of slices in each axis, forming a connected group of small cubes. You then move vertices around to reshape the cubes, and extrude more cubes, until you've built a very simple block figure that approximates the shape that you want to model. Then using surface subdivision and smoothing you can create smooth surfaces that follow almost any basic shape that you can imagine. You can control the sharpness of corners so that everything doesn't end up looking like PlaySkool toys.
|Start with in
the Object Editor with the front view filling the screen. Add a Cube
and double click on it to show it's properties dialog. Set the number
of divisions in the X, Y, and Z axii to 3, 4, and 1. Set the size
in the axii to 30, 40, and 10 units. Close the dialog and convert
the Cube to a Mesh with the Build->ConverToMesh menu command. The
image at the right is a wireframe Ortho view of the result.
This cube will form the basis for making the palm of your hand. You will extrude the fingers and thumb from the edges.
|Now you switch
to point-edit mode
where most of the work will be done. This also switches the screen
into wireframe and shows individual points as well for easier editing.
Make sure that you're in the Front view. Switch to point mode
and drag-select .
Drag select the next-to-top points on the left edge of the model.
Since you are using drag-select both the front and rear points will be
selected. Then change to move
mode and move the points slightly up and to the left as shown. Continue
down the left edge moving points out to form a curve as shown. This
will be the outside edge of the hand, away from the thumb.
Be careful not to move any points in the top row! These will be extruded later on to form the fingers. If you move them even slightly then your fingers won't form properly.
|Now move the other points
to form the shape at the left. This image was made from the normal
Object Editor view using wireframe mode.
Now you need to indent the front of the palm, and bring out the back side so they aren't so flat. Switch to the All view in the Point Editor. You will move the eight points hilighted at the left one-by-one. The back of the hand is facing you in the Front view, so yo need to move these points out towards you. First select one of the points in the Perspective view using the Arrow Select tool. Then switch to Move and in the Side move the point to the left a small amount. You can use the arrow keys to do this for precise control. Continue moving points in this manner until they are all done. Your palm is now finished.
|Next you will extrude the
thumb out of the side of the palm. Still in Point Editor, switch
to the All view. Switch to face mode
and select the next-to-lowest face on the right side of the palm.
It's probably easiest to do this in the Perspective view area. Now
that face out to the right about 10 units. Next switch to point mode
and in two steps, drag select each pair of points to turn the face up a
bit like the image at the right.
Now do two more extrudes and turn the end up a bit more each time to make the basic shape shown in the next image. That's all it takes to make a thumb! You might want to experiment with making the middle joints larger or other variations to see what effect they have on the final model.
|Now you're ready to make the fingers. Select the leftmost face of the top and extrude it three times to form the little finger. Make the first joint a little longer than the second, and the third joint the a bit shorter. This is all that's needed to make a finger. Smoothing will do the rest.
|Now select the face at the base of the middle finger and extrude it three times. Make the joints slightly longer than the little finger. Don't worry if the edges between the two fingers are touching. Smoothing will pull the surfaces apart later on. Finally make the pointer finger with three last extrudes, and your basic hand model is done!
|Before you smooth
the hand, you need to make some materials for it. Then in the Point
Editor you can apply them to different faces. Use the Options->Materials
command to show the Material Toolbar if it's not visible.
Double click on the New material to add a new material. This shows the material dialog where you can design your materials.
I made two: one called "skin" with a color of R=241, G=184, B=142, and Specular=0.4 and Roughness=8, and the other "nail" and has a color of R=250, G=225, B=202, Specular=0.3 and Roughness=10.
Select all the faces with the drag-select tool. Click on the "skin" material in the Material Toolbar and then on Apply. Select View->Full to see how it looks. Then select just the 4 fingernails, and apply the "nail" material. Deselect everything and you should see something like at the left.
|There's one more thing to do before smoothing. The edge of the nails will look better if you don't allow them to be smoothed quite as much as the rest of the hand. Change into line select mode and carefully select the 4 edges around each nail. I will be easier to see what you're doing in the Ortho view. You can use either the Point Select or Drag Select tool, or a combination. Remember that the drag select tool only selects things that are entirely within the box in the Point Editor. This makes it possible to select just one particular edge when several overlap. Your final selection should look like the image at the right. Apply the Edit->EdgeProperties command and select Rounded and set the Level to 1.
|Switch back to edit
mode in the object editor mode by clicking on the topmost arrow button
on the toolbar. It is easier to see what's happening if you view
your model's individual faces. The best way to do this is to double
click on it to show it's properties dialog, and set the Smooth Angel to
1.0. Or you can view it in the faceted mode by select the View->Preferences
menu item and then select flat in the dialog that appears.
Select your model. Then select the Build->SubdivideFaces menu item. Leave the tension value at the default 0 in the dialog that appears, and click OK. Then do the same thing again. Your model should look like that shown below!
|Straight fingers are pretty
boring. Using a couple of modifiers can really help here.
First make sure you're in the front view. Click on the add modifier
then click on the lower part of the small finger and drag up about 2/3
of the way. Select bend modifier from the dialog, and a yellow
modifier grid appears. It may not be visible if it's narrower than
the finger. If so you can either switch to wire frame, or just continue
and it should become visible.
Next select the scale non uniform tool and click and drag the left mouse button to the right until the modifier is slightly wider than the top part of your model. You also need to rotate the Modifier by 90 degrees around the Y axis with the Edit->Rotate->RotateY90 command.
Select both the model and the modifier (you can use the right mouse in point-select mode to add additional objects to the selected list) and click on Build->Modifiers->BindModifier from the menu. Then double click on the modifier and set the bend angle to 105 degrees. If there are long, jagged tears in the model, then you have included either too much or too little of the model within the modifier selection rectangle. Undo the Bind and adjust the size or position of the Modifier and try again.
When you are satisfied with the results, apply the Build->Modifiers->Effect command to complete the change. Continue adding Bend Modifiers until you have positioned the hand as you wish. You may want to set the Smoothing Angle to something like 75 degrees to keep it smooth looking everywhere.
|To download an Anim8or project containing the model built in the tutorial, and some intermediate snapshots, click here: tutorial_hand.zip.
|This page was last updated on March 17, 2001.
Copyright 2001 R. Steven Glanville