Google sketchup is a google product that was designed as a 3-D modeling program.
I will show you how to use it to make a halfpipe
Step 1: Platform
This is the step that shows what the base of the ramp will be
Step 2: Making It 3D, Putting Some Life Into It
here is what to do to make it 3-D.
You will use the push/pull tool and the curve tool.
Step 3: Delete the Lines
there should be one vertical line on each side, use the erase tool to delete them
if something bad happens stop and go to edit>undo erase
Step 4: Coping
This is how to make the pipe that is on the edge.
Step 5: Copy and Paste
Make the other half, this step uses the rotate tool, line draw, and move tool
Step 6: Finishing Touches
Finish it up!
you will use the paint tool, and the mouse tool.
Step 7: And Done!
GOOD JOB SOLDJA!! YOU SUVIVED THE MISSION!!!
credit to google for the software, good job google peeps!