1. Creating Leg Rigs
Step 1
Open 3ds Max.
Open the file which was saved in the last part of the tutorial.

Step 2
Go to Create >
System and click on Bones.
Step 3
Draw the bones for the
leg in the side viewport as shown in the following image.
Step 4
With the top bone
selected, go to Animation > IK Solver > HI Solver.
Step 5
Click on the last bone
to create IK chain as shown in the following image.
Step 6
With entire rig and IK
chain selected, drag these inside the left leg.
2. Creating Attachment Constraint for Foot
Step 1
With the first nut and
bolt selected, go to Animation > Constraint >Attachment Constraint
and then click on the left foot of the robot.
Step 2
Click on Set Position
and try to set the position of the nut and bolt by dragging the mouse over the
left foot. Once you get the correct position, turn off the Align To Surface
option.
Step 3
A dialogue box will
appear for the confirmation of animation. Just click on Yes.
Step 4
With the second nut and
bolt selected, go to Animation > Constraint >Attachment Constraint
and then click on the left foot of the robot.
Step 5
Click on Set Position
and try to set the position of the nut and bolt by dragging the mouse over the
left foot. Once you get the correct position, turn off the Align To Surface
option.
Step 6
A dialogue box will
appear for the confirmation of animation. Just click on Yes.
Step 7
With the third nut and
bolt selected, go to Animation > Constraint >Attachment Constraint
and then click on the left foot of the robot.

Step 8
Click on Set Position
and try to set the position of the nut and bolt by dragging the mouse over the
left foot. Once you get the correct position, turn off the Align To Surface
option.

Step 9
A dialogue box will
appear for the confirmation of animation. Just click on Yes.

3. Creating Attachment Constraints for Hands
Step 1
With the first nut and
bolt selected, go to Animation > Constraint >Attachment Constraint
and then click on the left hand of the robot.

Step 2
Click on Set Position
and try to set the position of the nut and bolt by dragging the mouse over the
left hand. Once you get the correct position, turn off the Align To Surface
option.

Step 3
A dialogue box will
appear for the confirmation of animation. Just click on Yes.

Step 4
Following the same way,
create attachment constraints for the rest of the nut and bolts also.

Step 4
Following
the same way, create the rig for the right leg and create attachment
constraints for the right hand and nuts and bolts as well.

4. Applying Skin Modifier
Step 1
With
the left leg selected, go to Modifier list and select Skin modifier.

Step 2
Inside
the Skin modifier tab, click on Add button. It opens the Select
Bones window. Select all three bones and click on Select.

Step 3
Now
you can see the three bones inside the list.

Step 4
Repeat
the same process for the right side’s leg.

5. Creating Attachment Constraint for Ankle
Step 1
With the ankle mesh
selected, go to Animation > Constraint >Attachment Constraint and
then click on the hand of the robot.

Step 2
Click on Set Position
and try to set the position of the nut and bolt by dragging the mouse over the
left hand. Once you get the correct position, turn off the Align To Surface
option.

Step 3
Follow the same process
for the right side’s ankle mesh also.

5. Creating Dummies
Step 1
Go to Create >
Helpers > Dummy and create two dummies for both feet as shown in the
following image.
Step 2
With both IK chains
selected, link these with their respective dummies as shown in the following
image.
Step 3
Create three more
dummies for the head and both shoulders as shown in the following image.
Step 4
With both shoulders
dummies selected, link these to the head dummy as shown in the following image.
Step 5
Link the head of the robot to the head dummy.
Step 6
The rigging is completed
now. You can check the rigging by moving the foot and head dummies. The robot
is now ready for animation.
Conclusion
Creating rigs and constraints is an essential part of animation as it makes the animation process easy. In the next part of the tutorial, I will show you how to create animation of the robot.
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