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Anonymous users2024-02-10I'm not a quasi-mention, the surface of the point, the projection of the word can actually be calculated by the intersection method.
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Anonymous users2024-02-09Your own data mining crystal epoxy rubber combat blows.
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Anonymous users2024-02-081. Points and lines on the cylinder and its surface.
In the top view, ab is an arc, and part of it is visible and part of it is not visible (b is in the invisible part); A in the main view'b'c'All three points are visible, a'b'Divide A on the line segment'and b'No other points outside the point are visible; A in the left view"Visible, nothing else is visible, a"b"Both the line segment and the c" projection are on the arc.
2. Lines on the cone and its surface.
In the top view, ab is a visible straight line, cd is a visible arc, the center of the circle is a, and the radius is long ac;
A in the left view"b"is the visible line, c"Point visible, c"d"The line is not visible except for point C", and it is a horizontal dotted line.
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Anonymous users2024-02-07Summary. Draw the third projection of each of the following rotary bodies, and make up the other two projections of the points or lines on its surface.
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Anonymous users2024-02-06Rotate the horizontal plane 90° along the OY axis and the resulting new projection surface is:
Rotating the horizontal plane 90° along the OY axis is actually rotating the original horizontal plane along the OY axis by an angle, moving it to a new position. Mathematically, this process can be represented by matrix multiplication. In this rift example, the new projection surface is represented as:
New Projection Surface = Rotation Matrix * Original Projection Surface Specifically, the new projection surface is a plane of the stove shell that passes through the center point of the original horizontal plane and is perpendicular to the original horizontal plane. Therefore, the normal vector of the new projection surface is the same as the oy axis, and its coordinates are (0, 0, 1). In space, the intersection of the new projection surface with the original horizontal plane is the oy axis, so the set of coordinates of the new projection surface is (0, y, z), where y and z are arbitrary real numbers.
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Anonymous users2024-02-051. Points and lines on the cylinder and its surface.
In the top view, ab is an arc, and part of it is visible and part of it is not visible (b is in the invisible part); A in the main view'b'c'All three points are visible, a'b'Divide A on the line segment'and b'No other points outside the point are visible; A in the left view"Visible, nothing else is visible, a"b"Both the line segment and the c" projection are on the arc.
2. Lines on the cone and its surface.
In the top view, ab is a visible straight line, cd is a visible arc, the center of the circle is a, and the radius is long ac;
A in the left view"b"is the visible line, c"Point visible, c"d"The line is not visible except for point C", and it is a horizontal dotted line.
It is to change the channel once: for example: the primary to L3 once, or the primary to the novice to drive once is to change L3 L2 L1
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