# -*- encoding=utf-8 -*-
# the script demonstrates a simple case of triaxial simulation using TriaxialCompressionEngine. More elaborated examples can be found in the triax-tutorial folder
from yade import pack

sp = pack.SpherePack()
## corners of the initial packing
mn, mx = Vector3(0, 0, 0), Vector3(10, 10, 10)

## box between mn and mx, avg radius ± ½(20%), 2k spheres
sp.makeCloud(minCorner=mn, maxCorner=mx, rRelFuzz=.2, num=2000)

## create material #0, which will be used as default
O.materials.append(FrictMat(young=15e6, poisson=.4, frictionAngle=radians(30), density=2600, label='spheres'))
O.materials.append(FrictMat(young=15e6, poisson=.4, frictionAngle=0, density=0, label='frictionless'))

## copy spheres from the packing into the scene
## use default material, don't care about that for now
O.bodies.append([sphere(center, rad, material='spheres') for center, rad in sp])
## create walls around the packing
walls = aabbWalls(thickness=1e-10, material='frictionless')
wallIds = O.bodies.append(walls)

triax = TriaxialCompressionEngine(
        wall_bottom_id=wallIds[2],
        wall_top_id=wallIds[3],
        wall_left_id=wallIds[0],
        wall_right_id=wallIds[1],
        wall_back_id=wallIds[4],
        wall_front_id=wallIds[5],
        internalCompaction=False,
        ## define the rest of triax params here
        ## see in pkg/dem/PreProcessor/TriaxialTest.cpp:524 etc
        ## which are assigned in the c++ preprocessor actually
        sigmaIsoCompaction=-50e3,
        sigmaLateralConfinement=-50e3,
        max_vel=10,
        strainRate=0.01,
        label="triax"
)

O.engines = [
        ForceResetter(),
        InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_Box_Aabb()]),
        InteractionLoop([Ig2_Sphere_Sphere_ScGeom(), Ig2_Box_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()]),
        GlobalStiffnessTimeStepper(active=1, timeStepUpdateInterval=100, timestepSafetyCoefficient=0.8),
        triax,
        # you can add TriaxialStateRecorder and such here…
        NewtonIntegrator(damping=.4)
]