Blender 3D and python scripting - part 003.

In the first tutorial I presented a simple script and in this one I improved it with a way to create lines with a number of points, to use pressurization and coloring according to these points.

I added comments in the source code to make it easier to understand.

Here is the result obtained for nineteen points:

This is the source code:

import bpy 
import random

#this is a for lines with N poins 
N = 19 

# this is default python script from the first tutorial
gpencil_data = bpy.data.grease_pencils.new("GPencil")
gpencil = bpy.data.objects.new(gpencil_data.name, gpencil_data)
bpy.context.collection.objects.link(gpencil)

gp_layer = gpencil_data.layers.new("lines")

gp_frame = gp_layer.frames.new(bpy.context.scene.frame_current)

gp_stroke = gp_frame.strokes.new()

gp_stroke.points.add(count=N)

# let's create a new material for pencil stroke 
gp_material_001 = bpy.data.materials.new(name="Grease pencil material 001")

# if you want to use Nodes 
gp_material_001.use_nodes = True

#this will add a diffuse color for this material 
gp_material_001.diffuse_color = (0.0, 0.0, 0.0, 1)

# create a new material for this grease pencil
bpy.data.materials.create_gpencil_data(gp_material_001)
# add the material to the grese pencil defined like gpencil 
gpencil.data.materials.append(gp_material_001)

for i in range (N):
    rand1 = random.randint(-3, 3)
    rand2 = random.randint(-3, 3)
    rand_size = random.randint(70, 76)
    gp_stroke.line_width = rand_size
    gp_stroke.points[i].co = (rand1,rand2,rand1)
    gp_stroke.points[i].co = (rand2,rand1,rand2)

    #this will create a random pressure 
    rand_pressure = random.randint(-3, 3) * 3
    #create random color for Red Green and Blue 
    rand_color_R = random.randint(0, 1)
    rand_color_G = random.randint(0, 1)
    rand_color_B = random.randint(0, 1)
    # set the pressure 
    gp_stroke.points[i].pressure = rand_pressure
    # set the color RGB with transparency 1
    gp_stroke.points[i].vertex_color = (rand_color_R,rand_color_G,rand_color_B, 1)