Cone

Cone



Start 3D Model Builder (Geometry Pack)

Click on and Project OpenDrawing CurvesCone

Draw 2 points

Draw a point at 0

Draw a point at 20

Press Pick as the action

Click on point (number 2 in our model) to select it

Copy and rotate

Point 0 will be the centre of the rotation...

Press 3D Cursor as the action

Click on point 0 or drag the 3D Cursor back to point 0

Press Turn as the action

Copy (hold CONTROL key) and turn / rotate the point around to (20)

Copy the points

Copy (hold CONTROL key) and turn / rotate the point again, each to (20), to create the points as illustrated

Select the points

Press Pick as the action

Click on the 4 points to select them (while holding the SHIFT key down)

Copy the points

Point 0 will be the centre of the rotation...

Press 3D Cursor as the action

Click on point 0 or drag the 3D Cursor back to point 0

Copy (hold CONTROL key) and turn / rotate the 4 points around to (80)

Copy (hold CONTROL key) and turn / rotate the 4 points again, around to (80), to create the points as illustrated

Copy and rotate the last point

Press Pick as the action

Click on point (number 15 in our model) to select it

Copy (hold CONTROL key) and turn / rotate the point around to (20)

Draw the line

Press Draw as the action

Press Lines to draw a line

Draw a line around the base of the cone

Draw the top point of the cone

Press View Rotate as the action

Rotate the view as illustrated

Press Points to work with points

Draw a point at 0 0 40

Draw triangles on the side

Press Triangles to draw triangles

Draw triangles on the side of the cone (maximum 4 or 5 points per triangle)

Finish the side of the cone

Press View Rotate as the action

Rotate the view to turn the cone around

Press Draw as the action

Draw more triangles as illustrated

Finish drawing the triangles around the sides of the cone

Draw triangles on the base

Press View Rotate as the action

Rotate the view to show the base of the cone

Press Draw as the action

Draw the triangles on the base of the cone in the same way (maximum 4 or 5 points per triangle)

Finish the cone

Finish drawing the triangles on the base of the cone

Change the lighting

Press the lighting button to show smooth lighting

Press the normals button to show lighting normals

The sides of the cone are nice and smooth but the base is wrong, it should have a flat color, so we will fix it

Pick triangles

Pick the triangles at the base of the cone

Copy the triangles

Copy (hold CONTROL key) and move the triangles down away from the base as illustrated...

Delete the old base

Delete the triangles at the base of the cone

Move the new base back

Move the triangles back up into position as illustrated...

Base is now flat

Can you see that the new triangles on the base now have their own set of normals that are independent of the sides of the cone?

Press Save to save the model

Next Activity



3D Graphics 101


Cylinder