polygon-clipping | Apply boolean polygon clipping operations ( union
kandi X-RAY | polygon-clipping Summary
kandi X-RAY | polygon-clipping Summary
Apply boolean polygon clipping operations (union, intersection, difference, xor) to your Polygons & MultiPolygons.
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- Displaying a sequence
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polygon-clipping Key Features
polygon-clipping Examples and Code Snippets
function clipLine(stream) {
var point0, // previous point
c0, // code for previous point
v0, // visibility of previous point
v00, // visibility of first point
clean; // no in
Community Discussions
Trending Discussions on polygon-clipping
QUESTION
I read similar suggested questions and their solutions, but could not find an answer.
I'm trying to draw a scene with an isometric view in OpenGL.
Draw func:
...ANSWER
Answered 2020-Jun-30 at 21:02The polygons are clipped by the near or far plane of the viewing volume.
When you do not set a projection matrix, then view space, clip space and normalized device space are the same. The normalized device space is a unique cube with the left, bottom, near of (-1, -1, -1) and right, top, far of (1, 1, 1). All the geometry which is not inside this cube is clipped.
Actually you draw a quad with a side length of 1. One vertex of the quad is at the origin of the view (0, 0, 0). The quad is rotated around the origin by glRotate
. Since the length of the diagonal of the quad is sqrt(2.0)
, one vertex of the rotated quad is clipped by either the near plane or the far plane.
If you construct and rotate a quad whose center is (0, 0 ,0), it will not be clipped, because the length form the center to each vertex is sqrt(2.0)/2.0
. That is less than 1 (distance to near and far plane form the center of the viewing volume)
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