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Blender (.py) Scripts...

Automating Blender ..

  

Fun with Fluids


The ability to add a simple fluid effect to a scene is brilliant! What is great is that you can do it easily with Blender scripts. We'll clear the scene, add a ground plane and a cube. Then we'll create an sphere - which will be our particle emmiter (fluid is going to flow out of this sphere).

Simply a matter of adding in a light and camera - and we're done!


This is what the fluid simulation looks like after a few frames in the layout window.
This is what the fluid simulation looks like after a few frames in the layout window.


import bpy

# 1. Clear the scene
bpy.ops.object.select_all(action='SELECT')
bpy.ops.object.delete()

# 2. Add plane (ground)
bpy.ops.mesh.primitive_plane_add(size=10, location=(0, 0, 0))
plane = bpy.context.object
plane.name = "Ground"

# 3. Add cube
bpy.ops.mesh.primitive_cube_add(size=2, location=(0, 0, 1))
cube = bpy.context.object
cube.name = "Cube"

# Make cube a fluid obstacle
bpy.ops.object.modifier_add(type='FLUID')
cube.modifiers["Fluid"].fluid_type = 'EFFECTOR'
#cube.modifiers["Fluid"].effector_settings.effector_type = 'OBSTACLE'

# 4. Add small ico sphere (twice height above cube)
bpy.ops.mesh.primitive_ico_sphere_add(radius=0.5, location=(0, 0, 5))
sphere = bpy.context.object
sphere.name = "FluidEmitter"

# 5. Set up fluid simulation
# First make the sphere a fluid emitter
bpy.ops.object.modifier_add(type='FLUID')
sphere.modifiers["Fluid"].fluid_type = 'FLOW'
sphere.modifiers["Fluid"].flow_settings.flow_type = 'LIQUID'
sphere.modifiers["Fluid"].flow_settings.flow_behavior = 'INFLOW'

# Create a domain (must be named "Fluid" in Blender 4.1)
bpy.ops.mesh.primitive_cube_add(size=8, location=(0, 0, 4))
domain = bpy.context.object
domain.name = "FluidDomain"

# Set as fluid domain
bpy.ops.object.modifier_add(type='FLUID')
domain.modifiers["Fluid"].fluid_type = 'DOMAIN'
domain.modifiers["Fluid"].domain_settings.domain_type = 'LIQUID'
domain.modifiers["Fluid"].domain_settings.use_mesh = True
domain.modifiers["Fluid"].domain_settings.resolution_max = 32 

# Add pink fluid material
mat = bpy.data.materials.new(name="PinkFluid")
domain.data.materials.append(mat)
mat.use_nodes = True
nodes = mat.node_tree.nodes
nodes.clear()

bsdf = nodes.new('ShaderNodeBsdfPrincipled')
bsdf.inputs['Base Color'].default_value = (0.9, 0.4, 0.7, 1.0)  # Pink
bsdf.inputs['Roughness'].default_value = 0.1

output = nodes.new('ShaderNodeOutputMaterial')
mat.node_tree.links.new(bsdf.outputs['BSDF'], output.inputs['Surface'])


# Add camera for better view
bpy.ops.object.camera_add(location=(8, -8, 6))
camera = bpy.context.object
camera.rotation_euler = (1.2, 0, 0.8)
bpy.context.scene.camera = camera

# Add lighting
bpy.ops.object.light_add(type='SUN', location=(5, 5, 10))
sun = bpy.context.object
sun.data.energy = 5

# Reset animation frame 
bpy.context.scene.frame_set(1)


Tweaks


We can reposition the camera and make the surface of the fluid 'smooth' - also increase the resolution and do a render - and this what it looks like.


Animation runs for about 50ish frames so we get the fluid mostly covered the cube and is filling up the domain box.
Animation runs for about 50ish frames so we get the fluid mostly covered the cube and is filling up the domain box.


import bpy

# 1. Clear the scene
bpy.ops.object.select_all(action='SELECT')
bpy.ops.object.delete()

# 2. Add plane (ground)
bpy.ops.mesh.primitive_plane_add(size=10, location=(0, 0, 0))
ground = bpy.context.object
ground.name = "Ground"

# 3. Add cube
bpy.ops.mesh.primitive_cube_add(size=2, location=(0, 0, 1))
cube = bpy.context.object
cube.name = "Cube"

# Make cube a fluid obstacle
bpy.ops.object.modifier_add(type='FLUID')
cube.modifiers["Fluid"].fluid_type = 'EFFECTOR'

# 4. Add small ico sphere (twice height above cube)
bpy.ops.mesh.primitive_ico_sphere_add(radius=0.5, location=(0, 0, 5))
sphere = bpy.context.object
sphere.name = "FluidEmitter"

# 5. Set up fluid simulation
# First make the sphere a fluid emitter
bpy.ops.object.modifier_add(type='FLUID')
sphere.modifiers["Fluid"].fluid_type = 'FLOW'
sphere.modifiers["Fluid"].flow_settings.flow_type = 'LIQUID'
sphere.modifiers["Fluid"].flow_settings.flow_behavior = 'INFLOW'

# Create a domain (must be named "Fluid" in Blender 4.1)
bpy.ops.mesh.primitive_cube_add(size=8, location=(0, 0, 3.85))
domain = bpy.context.object
domain.name = "FluidDomain"

# Set as fluid domain
bpy.ops.object.modifier_add(type='FLUID')
domain.modifiers["Fluid"].fluid_type = 'DOMAIN'
domain.modifiers["Fluid"].domain_settings.domain_type = 'LIQUID'
domain.modifiers["Fluid"].domain_settings.use_mesh = True
domain.modifiers["Fluid"].domain_settings.resolution_max = 64
# Adjust domain size by scaling the object
domain.scale = (1.0, 1.0, 1.0)  
bpy.ops.object.transform_apply(scale=True)  # Apply the scale

# Set smooth shading for fluid surface
domain.data.polygons.foreach_set('use_smooth', [True] * len(domain.data.polygons))
domain.data.update()

# Add pink fluid material
mat = bpy.data.materials.new(name="PinkFluid")
domain.data.materials.append(mat)
mat.use_nodes = True
nodes = mat.node_tree.nodes
nodes.clear()

bsdf = nodes.new('ShaderNodeBsdfPrincipled')
bsdf.inputs['Base Color'].default_value = (0.9, 0.4, 0.7, 1.0)  # Pink
bsdf.inputs['Roughness'].default_value = 0.1

output = nodes.new('ShaderNodeOutputMaterial')
mat.node_tree.links.new(bsdf.outputs['BSDF'], output.inputs['Surface'])


# Add camera for better view
bpy.ops.object.camera_add(location=(10, -10, 6))
camera = bpy.context.object
camera.rotation_euler = (1.2, 0, 0.8)
bpy.context.scene.camera = camera

# Add lighting
bpy.ops.object.light_add(type='SUN', location=(5, 5, 10))
sun = bpy.context.object
sun.data.energy = 5

# Reset animation frame 
bpy.context.scene.frame_set(1)






 
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