Potential index bug in shadow rendering

[TimSchneider42]

Hi,
I believe there is an indexing error in the shadow generation. The for loop in simOptical.py line 206 iterates variable s from 1 to num_step and retrieves values from the shadow_table at position s:

for s in range(1,num_step):
    cur_x = int(cx_origin + pr.shadow_step * s * ct)
    cur_y = int(cy_origin + pr.shadow_step * s * st)
    # check boundary of the image and height's difference
    if cur_x >= 0 and cur_x < psp.w and cur_y >= 0 and cur_y < psp.h and heightMap[cy_origin,cx_origin] > heightMap[cur_y,cur_x]:
        frame[cur_y,cur_x] = np.minimum(frame[cur_y,cur_x],v[s])

However, this means that v[0] is never used. Looking at generateShadowMasks.py, it seems to me as if for s = 1, v[0] should be retrieved instead of v[1]. Hence, I think this code should be:

for s in range(num_step):
    cur_x = int(cx_origin + pr.shadow_step * (s + 1) * ct)
    cur_y = int(cy_origin + pr.shadow_step * (s + 1) * st)
    # check boundary of the image and height's difference
    if cur_x >= 0 and cur_x < psp.w and cur_y >= 0 and cur_y < psp.h and heightMap[cy_origin,cx_origin] > heightMap[cur_y,cur_x]:
        frame[cur_y,cur_x] = np.minimum(frame[cur_y,cur_x],v[s])

Best,
Tim