Try Pangolin(1)

来源：互联网发布：九城软件电话编辑：程序博客网时间：2024/06/08 01:35

Tried to modify parameters in given examples on https://github.com/stevenlovegrove/Pangolin/tree/master/examples.

Reference: http://docs.ros.org/fuerte/api/pangolin_wrapper/html/index.html.

(1) HelloPangolin.cpp

Original Result: （With pangolin::ProjectionMatrix(1680,1480,420,420,320,240,0.2, 100)）

After commenting out "glEnable(GL_DEPTH_TEST);", I got:

According to https://www.khronos.org/opengles/sdk/docs/man/xhtml/glEnable.xml, GL_DEPTH_TEST, if enabled, do depth comparisons and update the depth buffer.

3D handler syntax:

    pangolin::Handler3D shandler(s_cam);    pangolin::View& d_cam = pangolin::CreateDisplay()        .SetBounds(0.0, 1.0, 0.0, 1.0, -640.0f/480.0f)        .SetHandler(&shandler);

//Here "handler" and "s_cam" are just names made by the user.

About .SetBounds and .SetHandler:

Modified some parameters:

With pangolin::ProjectionMatrix(1680,1480,420,420,320,240,0.2, 100), I got:
With pangolin::ProjectionMatrix(1680,1480,420,220,320,240,0.2, 100), I got:
With pangolin::ProjectionMatrix(680,480,420,420,620,240,0.2, 100), I got:

With pangolin::ModelViewLookAt(2,2,-2,0,0,0, pangolin::AxisY), I got the cube flipped horizontally as below:

With pangolin::ModelViewLookAt(2,-2,2,0,0,0, pangolin::AxisY), I got the cube flipped both horizontally and vertically as below:

According to: https://www.opengl.org/sdk/docs/man2/xhtml/glClear.xml, glClear sets the bitplane area of the window to values previously selected by glClearColor, glClearIndex, glClearDepth, glClearStencil, and glClearAccum.

Without glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT), I got:

Because the bitplane area of the window is not cleaned.
And without d_cam.Activate(s_cam), the result would be:

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