Determine the viewing angle and mark the viewing point and line of sight on the paper.
According to the direction of sight, draw the object along the outline of the object. You can draw lightly with a light pencil or brush, not too dark.
Confirm the position and shape of the outline, and draw the outline with darker colors or strokes after confirmation.
According to the position and shape of the contour line, the interior of the object can be filled, and different materials and textures can be represented by different colors or lines.
Finally, check whether the contour map meets the expectations and make necessary modifications and adjustments. ? It should be noted that drawing a contour map requires patience and care, and it needs to be constantly adjusted and modified during the drawing process to get a more perfect contour map.