• Thiết kế flash - Auxiliary viewsThiết kế flash - Auxiliary views

    Surfaces maintain basic shape from one view to the next, accept when viewed on edge Useful for objects with inclined and oblique surfaces

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  • Thiết kế flash - Visualization techniquesThiết kế flash - Visualization techniques

    Surfaces maintain basic shape from one view to the next, accept when viewed on edge Useful for objects with inclined and oblique surfaces Purdue Spatial Visualization Test: Rotations (PSVT:R) Mental Cutting Test (MCT) Mental Rotation Test (MRT)

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  • Thiết kế flash - Multiview projections 3Thiết kế flash - Multiview projections 3

    Fillet – inside rounding on a cast, forged or plastic part Round – outside rounding on a cast, forged or plastic part Typically 3 - 5 mm radius In multiview drawings, fillets/rounds only represented in views where you see curved shape

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  • Thiết kế flash - Multiview projections - 2Thiết kế flash - Multiview projections - 2

    A single-curved surface has curvature about a single axis Curvature only seen in one multiview Center lines used to indicate axis of curvature In isometric views, single-curved surfaces appear as ellipses

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  • Thiết kế flash - Multiview projections 1Thiết kế flash - Multiview projections 1

    Top and Front are vertically aligned, share width dimension Front and Right are horizontally in line, share height dimension Top and right are not aligned, share depth dimension

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  • Thiết kế flash - Orthographic projectionsThiết kế flash - Orthographic projections

    It can be shown that, in an isometric projection: Each axis is foreshortened to approximately 82% of its true length To correct for this, an isometric projection can be plotted at a scale of 1/.82 (~1.22). This convenient approximation of an isometric projection is called an isometric drawing

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  • Thiết kế flash - Oblique projectionsThiết kế flash - Oblique projections

    Determines relative emphasis of receding planes Related to angle of rotation of projector about the projection plane normal (b) Normally chosen to be 30 °, 45 °, or 60 °

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  • Thiết kế flash - Parallel projectionsThiết kế flash - Parallel projections

    Center of Projection is an infinite distance from projection plane  parallel projectors In a parallel projection: Parallel lines on object remain parallel on image No diminution of size Uniform foreshortening

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  • Thiết kế flash - Perspective projectionThiết kế flash - Perspective projection

    A vanishing point is found by passing a line through the center of projection, parallel to a set of parallel object edges. The point where the line pierces the projection plane is the vanishing point.

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  • Thiết kế flash - Projection theoryThiết kế flash - Projection theory

    Bounding Box = Principal Enclosing Box (PEB) Center of Projection = Station Point = Viewpoint of observer Projection Plane = Viewplane = Picture Plane Projectors = Sightlines = Line of Sight

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