我需要在屏幕上绘制几个坐标,不显示Z轴的坐标,但不显示Z轴值的坐标。我尝试在绘制坐标之前对坐标进行标准化。归一化时,绘制所有坐标。但是在非标准化坐标的情况下,Z轴的顶点是隐藏的。
OpenGL版本:ES 2.0
坐标:
float squareCoords[] = {
202.00002f, 244.00002f, 0.0f,
440.00003f, 625.00006f, 0.0f,
440.00003f, 625.00006f, 0.0f,
690.00006f, 186.0f,0.0f,
202.00002f, 244.00002f, 50.0f,
440.00003f, 625.00006f, 50.0f,
440.00003f, 625.00006f, 50.0f,
690.00006f, 186.0f, 50.0f
};
指数:
short[] drawOrder = {
0,1,2,3,
0,4,
1,5,
2,6,
4,5,6,7
};
绘制代码:
GLES20.glDrawElements(
GLES20.GL_LINES, drawOrder.length,
GLES20.GL_UNSIGNED_SHORT, drawListBuffer);
On Surface Changed code:
public void onSurfaceChanged(GL10 unused, int width, int height) {
mWidth = width;
mHeight = height;
GLES20.glViewport(0, 0, mWidth, mHeight);
float ratio = (float) mWidth / mHeight;
// this projection matrix is applied to object coordinates
// in the onDrawFrame() method
Matrix.orthoM(mProjMatrix, 0, 0f, width, 0.0f, height, 0, 50);
}
的OnDraw:
public void onDrawFrame(GL10 unused) {
Square square = new Square();
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT|GLES20.GL_DEPTH_BUFFER_BIT);
if (mFirstDraw)
mFirstDraw = false;
long time = SystemClock.uptimeMillis() % 4000L;
float angle = 0.090f * ((int) time);
// float angle = 90;
// Matrix.setRotateM(mRotationMatrix, 0, angle, 0, 0, -1.0f);
// angle += 0.7f;
if (angle > 360f)
angle = 0f;
Matrix.setLookAtM(mVMatrix, 0, 0f, 0f, 4f, 0f, 0f, 0f, 0f, 1f, 0f);
// projection x view = modelView
Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0);
// Creating rotation matrix
Matrix.setRotateM(rotationMatrix, 0, angle, -1f, 0f, 0f);
// rotation x camera = modelView
float[] duplicateMatrix = Arrays.copyOf(mMVPMatrix, 16);
Matrix.multiplyMM(mMVPMatrix, 0, duplicateMatrix, 0, rotationMatrix, 0);
square.draw(mMVPMatrix);
}
我旋转图表以确定是否绘制了Z轴上的顶点。
我个人认为这条线是罪魁祸首,在这里我给出了远值50和接近值0.我想知道这些值应该是什么
Matrix.orthoM(mProjMatrix, 0, 0f, width, 0.0f, height, 0, 50);
答案 0 :(得分:2)
这里的问题是远远不够高的价值。我把它放得远远超过500
Matrix.orthoM(mProjectionMatrix, 0, 0f, width, 0.0f, height,0, 500);
并将坐标更改为:
float squareCoords[] = {
202.00002f, 244.00002f, 0.0f,
440.00003f, 625.00006f, 0.0f,
440.00003f, 625.00006f, 0.0f,
690.00006f, 186.0f,0.0f,
202.00002f, 244.00002f, 200.0f,
440.00003f, 625.00006f, 200.0f,
440.00003f, 625.00006f, 200.0f,
690.00006f, 186.0f, 200.0f
};
现在正在工作。