Use of nicamera

1. Create camera.
1) obtained through ninew nicamera
2) read the NIF file and find the appropriate camera Node
2. Create Nirect <Float> object, set the camera viewlesize (assuming the object is nirect <float> kretviewpost)
1) full screen kretviewpost = nirect <float> (0.0f, 1.0f, 1.0f, 0.0f );
2) specific size
Suppose the current window size is 800*600. We want to display the content of camera in the range of 200*100 and the relative coordinate is (Cx = 300, Cy = 100, the size of the view is as follows:
Calculate the ratio of the View: ratioleft = Cx/800, ratiobuton = 1.0-(CY + 100)/600; ratioright = (cx + 200)/800, ratiotop = 1.0-cy/600;
Kretviewpost = nirect <float> (ratioleft ratioright, ratiotop, ratiobuton );
3. Create a nifrustum object and set the percentage of camera cross section bodies
Nifrustum (float fleft, float fright, float ftop, float fbottom, float fnear, float ffar, bool bortho = false)
The value of fleft/fright/ftop/fbuttom depends on the center and display mode of the display area.
1) display mode:
A) orthogonal mode (bortho = true)
If the display area is 200*100, fleft =-(200/2), fright = 200/2, ftop = 100/2, fbuttom =-100/2;
B) non-orthogonal mode (bortho = false)
No matter how large the display area is, the fleft/fbuttom values are between [-0.5, 0.0), and the values of fright/ftop are between (0.0, 0.5]. For example: (-0.4, 0.4, 0.46,-0.46)
The difference between orthogonal and non-orthogonal is that when the non-orthogonal mode is used, the image size of camera is affected by the distance from the focused object (the zoom-in function can be achieved ), the orthogonal mode does not.
2) display Ratio
In orthogonal mode, adjustaspectratio is called, while in non-orthogonal mode, the ratio of fleft (fright) to fbuttom (ftop) is set.
3) Crop distance (for example, fnear = 1.0f, ffar = 1000.0f)
4. Set viewport and frustum respectively through nicamera: setviewport (const nirect <float> &) and camera: setviewfrustum (const nirustum &).