Changing tile location

Question

I want to be able to render a tile and then move to the left and render that tile

Specify tile size for Blender Cycles rendering via command line

So far I have gotten this... I have no idea how to make it loop to the next one. I'm new to this.

It runs without error but I'm sure its all wrong:

import bpy

for scene in bpy.data.scenes:
    mx = scene.render.border_max_x = 0
    sx = scene.render.border_min_x = 0
    sy = scene.render.border_min_y = 0
    my = scene.render.border_max_y = 0
    scene.render.use_border = True
    scene.render.use_crop_to_border = True
if 1 > 0:
    my = my + .2;
    mx = mx + .2;
    scene.render.border_max_x = mx
    scene.render.border_min_x = 0
    scene.render.border_min_y = 0
    scene.render.border_max_y = my
    int (my);
    int (mx);

    bpy.ops.render.render()

Answer 1

An if statement does not cause the code following it to loop, it merely executes the code indented after the if only if the statement following the if (in this case 1 > 0) is true.

While loop:

If I understand what you are trying to do, you want a while statement instead of an if statement:

var = 0 # define the variable "var"
while 10 > var: # while 10 is greater than whatever value "var" is equal too
    var = var + 1 # increment var by one
    print (var) # print var to the console

This will execute the code indented after while 10 > var: until var is no longer less than 10.

The result of running the above code is:

1
2
3
4
5
6
7
8
9
10

So if we apply this to your code:

import bpy

var = 0 # assign these variables to 0
mx = 0 # I removed these from the scene for loop because you don't need to set them again for eaach scene.
sx = 0
sy = 0
my = 0
for scene in bpy.data.scenes: # loop through each scene in the .blend and set these values in each one:
    scene.render.use_border = True # enable borders
    scene.render.use_crop_to_border = True # enable crop to border

while var < 3: # as long as "var" is equal to a number less than 3, execute:
    var = var + 1 # increase "var" by one (very important if we don't want to run the loop for infinity)
    my = my + .2 
    mx = mx + .2
    scene.render.border_max_x = mx
    scene.render.border_min_x = 0
    scene.render.border_min_y = 0
    scene.render.border_max_y = my
    #                                                          vv var is an INT, so we convert it to a string for the perposes of using it in the output image file name
    bpy.context.scene.render.filepath = "/tmp/test_render_" + str(var) + ".png" # bpy.context.scene gives us the currently open scene, so we can set the path for outputting images for only that scene.
    bpy.ops.render.render(write_still=True) # I added the write_still=True so the render is writted to the file spcified in scene.render.filepath

Explanation:

Here is an explanation of what each line does:

---

import bpy This imports the bpy module.

---

var = 0 This assigns "var" to a value, 0. See the wiki for more about variables.

---

for scene in bpy.data.scenes: This is a for statement that will repeat the code indented after this line for each scene in bpy.data.scenes. (this will also assign scene as a kind of variable containing the location of the current scene being iterated through.)

---

scene.render.use_border = True This sets blender's variable use_border to True. This is the same as ticking the check box in the GUI (Render settings > Dimensions):

To illustrate this, you can run bpy.context.scene.render.use_border = True in the Python console and the Border check box will become enabled in the GUI.

---

scene.render.use_crop_to_border = True This enables Crop to border ([use_crop_to_border][13])

---

while var < 3: Test if var is equal to a value less than 3. If true, then execute the indented code following this line and test if var < 3 again. If false, skip to the next unindented code.

---

var = var + 1 Assign var to the result of var + 1 (increment by one)

---

scene.render.border_max_x = mx Set blender's variable border_max_x to the current value of the variable mx.

---

bpy.context.scene.render.filepath = "/tmp/test_render_" + str(var) + ".png" Use bpy.context to get the active scene and set the scene render property filepath to a string. to use the variable var (type INT) in the string, it needs to be converted to a string type with str(var). See the wiki for more info about strings and variables.

---

bpy.ops.render.render(write_still=True) This renders the image and writes it to the path specified in filepath.

---

Result:

The above code outputs the following images in /tmp/ when run in the Text editor:

test_render_1.png is created with the border settings set to these values:

scene.render.border_max_x = .2
scene.render.border_min_x = 0
scene.render.border_min_y = 0
scene.render.border_max_y = .2

---

test_render_2.png is created with the border settings set to these values:

scene.render.border_max_x = .4
scene.render.border_min_x = 0
scene.render.border_min_y = 0
scene.render.border_max_y = .4

---

test_render_3.png is created with the border settings set to these values:

scene.render.border_max_x = .6
scene.render.border_min_x = 0
scene.render.border_min_y = 0
scene.render.border_max_y = .6

The total number of images is limited to 3 because the third time the loop code is executed, the variable var is incremented to 3 which is not less than 3.

Here is a code that moves to the next "tile" over:

import bpy

var = 0 
mx = 0 
sx = -.2
sy = 0
my = .2
for scene in bpy.data.scenes: 
    scene.render.use_border = True 
    scene.render.use_crop_to_border = True

while var < 3:
    var = var + 1
    mx = mx + .2
    sx = sx + .2
    print (mx)
    print (sx)
    scene.render.border_max_x = mx
    scene.render.border_min_x = sx
    scene.render.border_min_y = sy
    scene.render.border_max_y = my

    bpy.context.scene.render.filepath = "/tmp/test_render_" + str(var) + ".png"
    bpy.ops.render.render(write_still=True)