Fix a bug in COLMAP parser

Author: hangg7

examples/gsplat_utils/datasets/colmap.py

@@ -87,7 +87,7 @@ def __init__(
                 params = np.empty(0, dtype=np.float32)
                 camtype = "perspective"
             if type_ == 2 or type_ == "SIMPLE_RADIAL":
-                params = np.array([cam.k1], dtype=np.float32)
+                params = np.array([cam.k1, 0.0, 0.0, 0.0], dtype=np.float32)
                 camtype = "perspective"
             elif type_ == 3 or type_ == "RADIAL":
                 params = np.array([cam.k1, cam.k2, 0.0, 0.0], dtype=np.float32)