Lesson Notes By Weeks and Term v3 - Junior Secondary 3
One-point Perspective Drawing
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One-point Perspective Drawing
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Subject: Basic Technology
Class: Junior Secondary 3
Term: 2nd Term
Week: 7
Theme: Drawing Practice
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explain one-point perspective drawings with examples; state the principles of one-point perspective drawings; make one-point perspective drawings of simple shaped blocks.
2. 1. Definition of One-point Perspective Drawing One-point perspective drawing is a method of representing three-dimensional objects on a two-dimensional plane so that objects appear to recede into the distance, creating an illusion of depth. In this method, all parallel lines perpendicular to the viewer's eye converge at a single point on the horizon line, known as the vanishing point. This technique is typically used when the front face of the object is parallel to the picture plane (the imaginary transparent screen between the viewer and the object). 2.
2. Key Terms Horizon Line (HL): This is an imaginary horizontal line that represents the eye-level of the viewer. It separates the sky from the ground. Objects above the horizon line are seen from below, and objects below are seen from above. When standing on a flat Nigerian savanna or looking at the sea, the horizon line is clearly visible.
Vanishing Point (VP): This is a single point located on the horizon line towards which all parallel lines (known as orthogonal lines) that are perpendicular to the picture plane appear to converge and vanish. It is the point of deepest recession in the drawing.
Orthogonal Lines: These are parallel lines in a 3D object that appear to converge towards the vanishing point in a perspective drawing. They represent the depth of the object.
Transverse Lines: These are lines in a perspective drawing that remain parallel to the picture plane. They include vertical lines (perpendicular to the horizon line) and horizontal lines (parallel to the horizon line) that define the height and width of the object's faces. The front face of an object in one-point perspective is defined by transverse lines.
Picture Plane: An imaginary transparent plane on which the 3D scene is projected to create a 2D drawing. In one-point perspective, the front face of the object is often placed directly on or parallel to the picture plane. 2.
3. Principles of One-point Perspective Drawing
1. Convergence to a Single Vanishing Point: All parallel lines that recede into the distance (orthogonal lines) appear to meet at a single vanishing point (VP) located on the horizon line (HL).
2. Horizon Line as Eye Level: The horizon line always represents the viewer's eye level. Objects positioned above the HL are viewed from below, and objects below the HL are viewed from above. Objects intersecting the HL are viewed at eye level.
3. Apparent Size Reduction: Objects appear progressively smaller as they recede further into the distance towards the vanishing point, creating the illusion of depth.
4. Parallel Transverse Lines: Vertical lines in the object remain vertical in the drawing, and horizontal lines parallel to the picture plane remain horizontal in the drawing. These are the transverse lines.
5. Front Face Parallel to Picture Plane: In one-point perspective, one face of the object (typically the front face) is always drawn parallel to the picture plane, meaning its true shape and dimensions can be seen without distortion. 2.
4. Step-by-Step Procedure for Drawing a Simple Rectangular Block in One-point Perspective Worked
Example: Drawing a Rectangular Block (e.g., a simple building or a carton of goods)
Steps:
1. Draw the Horizon Line (HL) and Vanishing Point (VP): Draw a straight horizontal line across the drawing paper. This is the Horizon Line. Mark a single point anywhere on this line. This is the Vanishing Point (VP). The position of the VP influences the view (e.g., centered VP gives a straight-on view).
Example: Draw HL midway up the page, place VP centrally.
2. Draw the Front Face of the Block: Draw a rectangle or square (the front face of the block) anywhere on the paper. This face should be drawn using only horizontal and vertical lines.
Consider its position relative to the HL: Below HL: The top surface of the block will be visible (viewer looking down).
Above HL: The bottom surface will be visible (viewer looking up).
Intersecting HL: Only the front and side faces will be visible (viewer at eye level).
Example: Draw a rectangle below the HL.
3. Draw Orthogonal Lines: * From each corner of the or square (the front face of the block) anywhere on the paper. This face should be drawn using only horizontal and vertical lines.
Consider its position relative to the HL: Below HL: The top surface of the block will be visible (viewer looking down).
Above HL: The bottom surface will be visible (viewer looking up).
Intersecting HL: Only the front and side faces will be visible (viewer at eye level).
Example: Draw a rectangle below the HL.
3. Draw Orthogonal Lines: From each corner of the front face, lightly draw straight lines (orthogonal lines) extending towards the Vanishing Point (VP). These lines represent the receding edges of the block.
Example: Connect all four corners of the rectangle to the VP.
4. Determine the Depth and Draw the Back Face: Along one of the orthogonal lines, choose a point to represent the desired depth of the block. From this point, draw horizontal and vertical lines (transverse lines) that are parallel to the lines of the front face. These lines will connect to other orthogonal lines, forming the back face of the block.
Example: For a rectangle below HL: Draw a vertical line between two bottom orthogonal lines, then a horizontal line from its top to the third orthogonal line. Ensure these lines are parallel to the corresponding lines of the front face.
5. Darken Visible Edges and Erase Construction Lines: Carefully go over all the visible edges of the completed block with a darker line. Erase all the light construction lines (orthogonal lines beyond the back face and any unnecessary lines) to make the drawing clear and neat.
Example: Trace the rectangle, the segments of the orthogonal lines forming the depth, and the newly drawn back face. Erase remaining orthogonal lines. Illustrative Sketch (for teacher's understanding, to be demonstrated on board): ``` VP . /|\ / | \ / | \ / | \ / | \ ------------------ HL ------------------ | | | | | | |----Front Face----| | | | | | | | | | |__________________| \ | / \ | / \ | / \|/ . (Back Face) ``` (This is a very simplistic text representation. On the board, the teacher draws the front rectangle, then connects its corners to VP with faint lines, then draws a smaller rectangle (back face) within these faint lines, and finally darkens the visible edges.)* 3.
1. Introduction (5 minutes)
Teacher Activity: Begin by reviewing the previous topic (e.g., Isometric Drawing), asking students to recall its purpose and characteristics. Introduce the idea of representing 3D objects realistically, asking students how artists and designers make things look far away or close up in a drawing. Show examples of pictures or photographs of a long road, railway track, or a corridor receding into the distance to illustrate the concept of convergence.
Student Activity: Respond to questions about isometric drawing. Observe and discuss the visual examples, sharing initial thoughts on how depth is achieved. 3.
2. Explanation of Key Concepts (15 minutes)
Teacher Activity: Introduce "One-point Perspective Drawing" and explain its definition using simple language.
Define and illustrate the key terms: Horizon Line (HL), Vanishing Point (VP), Orthogonal Lines, and Transverse Lines, drawing them on the board.
Use common Nigerian examples: "Imagine standing on a long, straight road in your village; the point where the road seems to disappear is the vanishing point on the horizon." Explain the five principles of one-point perspective drawing clearly, relating them to the visual examples.
Student Activity: Listen attentively, take notes on definitions and principles. Ask clarifying questions. Identify HL and VP in the visual examples provided. 3.
3. Demonstration of Drawing Procedure (20 minutes)
Teacher Activity: Demonstrate step-by-step on the chalkboard/whiteboard how to draw a simple rectangular block (e.g., a simple room, a house facade, or a carton) using the one-point perspective method. Emphasize the use of light construction lines first, then darkening visible edges. Draw examples of the block positioned below, above, and intersecting the horizon line to show different views (e.g., viewing a table from above, a shelf from below). Ensure all students can clearly see the demonstration.
Student Activity: Observe the teacher's demonstration carefully, paying attention to each step. Ask questions about specific drawing techniques or line types. Mentally follow the steps, preparing for their own practical work. 3.
4. Guided Practice (25 minutes)
Teacher Activity: Provide students with drawing paper, pencils, rulers, and erasers. Instruct students to attempt drawing a simple rectangular block (e.g., a matchbox, a small table) on their own, guided by the steps demonstrated. Circulate around the classroom, providing individual assistance, correcting errors, and offering constructive feedback. Encourage peer assistance where appropriate.
Student Activity: Practice drawing a simple rectangular block using one-point perspective. Apply the step-by-step procedure. Seek assistance from the teacher or peers when encountering difficulties. 3.
5. Conclusion (5 minutes)
Teacher Activity: Summarize the key takeaways of the lesson, reiterating the definition, principles, and basic steps of one-point perspective drawing. Assign homework related to drawing additional objects.
Student Activity: Participate in a brief recap. Note down homework assignment.
Materials: Chalkboard/Whiteboard, markers/chalk Rulers (at least 30 cm) Pencils (HB or 2B recommended) Drawing papers (A4 or A3 size)
Erasers Visual aids: Pictures/charts demonstrating one-point perspective (e.g., a road receding, a corridor, a simple building sketch).
Optional: Protractor or set squares for accuracy in drawing horizontal/vertical lines. Students are given these questions to practice immediately after the demonstration.
Question 1: Define one-point perspective drawing in your own words.
Solution: One-point perspective drawing is a technique used to create the illusion of depth and distance on a flat surface. It achieves this by making all parallel lines that are perpendicular to the viewer's eye appear to converge at a single vanishing point on the horizon line.
Commentary: This assesses understanding of the core concept. The answer should reflect the key elements: depth, single vanishing point, and horizon line.
Question 2: State three (3) principles of one-point perspective drawing.
Solution:
1. All parallel lines perpendicular to the picture plane appear to converge at a single vanishing point (VP) on the horizon line (HL).
2. The horizon line (HL) always represents the viewer's eye level.
3. Objects appear to get smaller as they recede into the distance towards the vanishing point.
4. Vertical lines remain vertical, and horizontal lines parallel to the picture plane remain horizontal. (Any three of these are acceptable).
Commentary: This checks recall of fundamental rules. Students should be able to articulate these principles clearly.
Question 3: Draw a one-point perspective view of a simple rectangular block (e.g., a shoebox) positioned below the Horizon Line.
Solution: (Teacher would draw this on the board, and students would replicate.)
Step-by-step solution breakdown:
1. Draw a Horizon Line (HL) and mark a Vanishing Point (VP) on it.
2. Draw a rectangle (representing the front face of the shoebox) below the HL.
3. From each corner of the rectangle, draw light orthogonal lines extending towards the VP.
4. Along the orthogonal lines, draw a shorter vertical line parallel to the vertical sides of the front face, and a shorter horizontal line parallel to the horizontal top side of the front face, to form the back edges of the box. Ensure the back face is further away from the viewer.
5. Darken the visible edges of the box and erase all unnecessary construction lines. The top surface of the box should be visible. ``` VP . /|\ / | \ / | \ ----HL------------------------ | / \ | | / \ | | / \ | | / \ | |-----------| Back Edge (horizontal) | | |-----------| Front Face (visible top, sides) \ / \ / \ / \ / \ / \ / . (Another text representation, to be drawn correctly by teacher) ``` (Teacher should draw a proper diagram showing the front face, orthogonal lines converging to VP, and then the hidden back face formed by transverse lines, with visible edges darkened.)
Commentary: This assesses practical application. Students should demonstrate correct placement of HL, VP, front face, orthogonal lines, and the formation of the back face with correct line types and neatness. The position below the HL should correctly show the top surface.
Question 4: Draw the interior of a simple rectangular room (like a classroom), looking towards the front wall, using one-point perspective.
Solution: (Teacher would draw this on the board, and students would replicate.)
Step-by-step solution breakdown:
1. Draw a large Horizon Line (HL) across the middle of the paper, and mark a Vanishing Point (VP) centrally on it. This VP will be the point directly in front of the viewer.
2. Draw a large rectangle, representing the back wall of the room, around the VP. The VP should be within this rectangle.
3. From the four corners of this back wall rectangle, draw orthogonal lines extending outwards, away from the VP. These lines will form the receding walls, ceiling, and floor.
4. Draw vertical lines (for side walls) and horizontal lines (for ceiling and floor) from the points where the orthogonal lines meet the edges of the drawing paper (or stop at a chosen point for the opening of the room).
5. Darken the lines that form the edges of the room (where the walls meet the ceiling and floor). 6. (Optional: Add details like a window or door on the back wall, using orthogonal lines to give them depth.)
Commentary: This expands on the block drawing to an interior space. Key aspects are using the back wall as
Architecture and Construction in Nigeria: One-point perspective is extensively used by architects and civil engineers in Nigeria to draw preliminary sketches and conceptual designs for houses, schools, hospitals, and office buildings. It helps clients visualize the appearance of a building from a specific viewpoint before construction begins. For example, a student designing their "dream house" can use this technique to show its front facade and how it recedes.
Interior Design and Furniture Arrangement: Individuals and professional interior designers use one-point perspective to plan and visualize room layouts, furniture placement (e.g., arranging chairs, tables, and cabinets in a Nigerian living room or office), and overall aesthetics. This helps in making informed decisions about space utilization and decor without physically moving items.
Product Design and Advertising: Manufacturers and advertising agencies in Nigeria use perspective drawings to create compelling visuals for new products, packaging (e.g., designing the look of a new 'Indomie' noodle pack or a 'Peak Milk' tin), and promotional materials. It makes products look realistic and appealing to potential consumers on billboards or in magazines.
Town Planning and Urban Development: Urban planners can use one-point perspective to illustrate how new road networks, pedestrian walkways, or specific community structures will appear within existing or planned urban landscapes in Nigerian cities, aiding in development proposals and community engagement.