script for rendering a simple scene

Question

I am beginner in python script with blender. To start, I write a script to render a simple scene using the cycle engine and a fisheye camera. here is my script:

import bpy
from mathutils import *
from math import *
#delete the cube
bpy.ops.object.delete(use_global=False)
# Add a camera fish eye.
bpy.context.scene.render.engine = 'CYCLES'
bpy.ops.object.camera_add(view_align=True, location=(0, 0, 2.5), rotation=(0, 0, 0))
bpy.context.object.rotation_euler[0] = 0
bpy.context.object.rotation_euler[1] = 0
bpy.context.object.rotation_euler[2] = 0
bpy.context.object.data.type = 'PANO'
bpy.context.object.data.cycles.fisheye_lens = 2.7
bpy.context.object.data.cycles.fisheye_fov = 3.14159
bpy.context.object.data.sensor_width = 8.8
bpy.context.object.data.sensor_height = 6.6
#Add a lamp.
bpy.ops.object.lamp_add(type='POINT', radius=1, view_align=False, location=(0, 1.5, 2.5), 
layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))
bpy.context.object.data.shadow_soft_size = 0.01
bpy.context.object.data.cycles.cast_shadow = True
#Import the model .mhx in the scene
bpy.ops.import_scene.makehuman_mhx(filepath="/Users/xxx/Documents/MakeHuman/v1/exports/scene1/person1.mhx")
#Set the rendering parameter
bpy.context.scene.render.resolution_x = 1360
bpy.context.scene.render.resolution_y = 1024
bpy.context.scene.render.resolution_percentage = 50
bpy.context.scene.frame_start = 1
bpy.context.scene.frame_end = 2
bpy.context.scene.frame_step = 1
bpy.context.scene.render.pixel_aspect_x = 1
bpy.context.scene.render.pixel_aspect_y = 1
bpy.context.scene.render.use_file_extension = True
bpy.context.scene.render.image_settings.color_mode ='RGBA'
bpy.context.scene.render.image_settings.file_format='PNG' 
bpy.context.scene.render.filepath = "/Users/xx/Desktop/pythonscript/"
bpy.context.scene.render.image_settings.compression = 90
##sampling;=path tracing 
bpy.context.scene.cycles.progressive = 'PATH'
bpy.context.scene.cycles.samples = 50
bpy.context.scene.cycles.max_bounces = 1
bpy.context.scene.cycles.min_bounces = 1
bpy.context.scene.cycles.glossy_bounces = 1
bpy.context.scene.cycles.transmission_bounces = 1
bpy.context.scene.cycles.volume_bounces = 1
bpy.context.scene.cycles.transparent_max_bounces = 1
bpy.context.scene.cycles.transparent_min_bounces = 1
bpy.context.scene.cycles.use_progressive_refine = True
bpy.context.scene.render.tile_x = 64
bpy.context.scene.render.tile_y = 64
#insert the walls
#1)the floor
bpy.ops.mesh.primitive_plane_add(radius=1, view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))
bpy.context.object.dimensions[0] = 4
bpy.context.object.dimensions[1] = 4
bpy.context.object.dimensions[2] = 0
#1)Wall 1
bpy.ops.mesh.primitive_cube_add(view_align=False, enter_editmode=False, location=(0, 2, 1.25), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))
bpy.context.object.dimensions[0] = 4
bpy.context.object.dimensions[1] = 0.05
bpy.context.object.dimensions[2] = 2.5
bpy.context.object.location[2] = 1.25
bpy.context.object.location[1] = 2

#Render results
bpy.ops.render.render(animation=True)

I remark that the image rendered using the GUI and using the script are different.

Answer 1

You created a second camera, but you didn't assign it to be the camera for the scene:

--- /var/tmp/se1.py     2015-06-22 16:37:30.703514909 -0400
+++ /var/tmp/se2.py     2015-06-22 16:41:47.687236739 -0400
@@ -14,6 +14,7 @@
 bpy.context.object.data.cycles.fisheye_fov = 3.14159
 bpy.context.object.data.sensor_width = 8.8
 bpy.context.object.data.sensor_height = 6.6
+bpy.context.scene.camera = bpy.context.object
 #Add a lamp.
 bpy.ops.object.lamp_add(type='POINT', radius=1, view_align=False, location=(0, 1.5, 2.5), 
 layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))

You might also want to set your frame_end=1 instead of 2.

Another strange thing about this script is that it keeps creating new objects, so you can't run it repeatedly in the same scene without weirdness (probably some Z fighting) as objects and lamps accumulate.