Some confusion about Qt Canvas3D

  • I'm using Qt Canvas3D module to draw a 3D scene,

    when I use

    var size = 1024;
    gl.bindBuffer(gl.ARRAY_BUFFER, mybuffer) ;
    gl.bufferData(gl.ARRAY_BUFFER, 4*size, gl.DYNAMIC_DRAW);
    gl.bufferSubData(gl.ARRAY_BUFFER, offset, myArrayData);

    this segment of code works well.
    but when I set the variable size to 8192 or larger, it will be something wrong and show me a very strange graphics, and then it won't show ever.

    But sometimes, I set size to 8192, it may work as my expectation. I don't know what's wrong with the code.

    Is my offset wrong or the the function bufferData(glEnums target, long size, glEnums usage) I use wrong?

    and if I use a new Float32Array() as the second argument, it will work very normally, but I dont know how to add more vertices into the buffer, can anyone help me?

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