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By seghier
#395891
Hello
this is a script to add cameras around an object ; i have a problem with the top and the bottom cameras
both of them have roll angle = 20520 (360*57) and the view rotated by 180°; when i change this value the resolution became 0 x 0 and this problem fixed when i change the x or the y value to : 0.00001 but it is not precise.
in studio a top or a bottom camera with this settings:
position(x=0,y=n,z=0) , target(0,0,0) , target distance =n
always the resolution width and height = 0
** is there way to control roll angle with pymaxwell ? maybe that fix the problem
Code: Select all

from pymaxwell import *
import os
import math


def ibl():


    mxsFile = 'F:/change ibl/math/cams.mxs'
    camera_name = 'cam'
    active_camera = 'perspective'

    scene = Cmaxwell(mwcallback)
    scene.readMXS(mxsFile)

    a = 360  # (degree)
    r1 = 10  # sphere radius : variable
    n1 = 20  # cameras longitudinal numbers : variable  <<<<<<---------------------------------------||
    b1 = float(a) / n1  # variable

    n2 = 10  # cameras latitudinal numbers : variable   <<<<<<---------------------------------------||
    b2 = float(a) / 2 / n2  # variable

    f =  n2/2
    l1 = list(reversed(range(0, f)))   # half sphere top
    l2 = list(reversed(range(f, n2)))
    l3 = l1+l2                         # full sphere

    # top camera
    camera = scene.addCamera(camera_name+'0', 1, 1.0 / 800.0, 0.04, 0.035, 400, "CIRCULAR", 0, 0, 25, 400, 300, 1)
    camera.setStep(0, Cvector(0, r1, 0), Cvector(0.0, 0.0, 0.0), Cvector(0.0, 1.0, 0.0), 0.035, 8.0, 0)

    #for i in range(n2):
    for i in l3:
        #print i
        v1 = b2 * i
        if v1 < 90:
            pass
            #print v1
        if v1 > 90:
            v1 = v1-180
            #print v1
        if not v1 == 90:
            print v1
            v2 = math.radians(v1)  # radians
            cosa = round(math.cos(v2), 10)
            sina = round(math.sin(v2), 10)
            r2 = r1 * cosa
            z = r1 * sina
            # print '------------------------------'
            # print 'Radius: ', round(r2, 5)
            # print '------------------------------'
            for i in range(n1):
                # print i+1
                c1 = b1 * i
                if c1 <= 180:
                    pass
                    #print c1
                if c1 > 180:
                    c1 = c1 - 360
                    #print c1
                c2 = math.radians(c1)  # radians
                #print c2
                sinb = round(math.sin(c2), 10)
                cosb = round(math.cos(c2), 10)
                x = r2 * sinb
                y = r2 * cosb
                # print(round(x, 5), round(z, 5), round(y, 5))
                # print round(z, 5)

                # Create 360 cameras
                camera = scene.addCamera(camera_name+'1', 1, 1.0 / 800.0, 0.04, 0.035, 400, "CIRCULAR", 0, 0, 25, 400, 300, 1)
                camera.setStep(0, Cvector(round(x, 4), round(z, 4), round(y, 4)), Cvector(0.0, 0.0, 0.0),
                               Cvector(0.0, 1.0, 0.0), 0.035, 8.0, 0)


    # perspective active camera
    camera = scene.addCamera(active_camera, 1, 1.0 / 800.0, 0.04, 0.035, 400, "CIRCULAR", 0, 0, 25, 400, 300, 1)
    camera.setStep(0, Cvector(35, 8, 25), Cvector(0.0, 0.0, 0.0), Cvector(0.0, 1.0, 0.0), 0.035, 8.0, 0)
    camera.setActive()


    output = 'F:/change ibl/math/cams1.mxs'
    print(output)
    ok = scene.writeMXS(output)

if __name__ == "__main__":

    if ibl():
        print ('OK')
User avatar
By Brany
#395911
You have to compute and set the "up" vector for the "setStep" method. If you always use (0, 1, 0) as up vector, there is a problem when the "origin->focalpoint" vector has the same direction than the "up" vector (which is the case of your top and bottom cameras). Resuming, you control the roll angle with the "up" vector.

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