rb_static_reset_position_rotation.py

import harfang as hg
import math

def CreatePhysicCubeEx(scene, size, mtx, model_ref, materials, rb_type, mass):
    node = hg.CreateObject(scene, mtx, model_ref, materials)
    node.SetName("Physic Cube")
    rb = scene.CreateRigidBody()
    rb.SetType(rb_type)
    node.SetRigidBody(rb)

    # create custom cube collision
    col = scene.CreateCollision()
    col.SetType(hg.CT_Cube)
    col.SetSize(size)
    col.SetMass(mass)

    # set cube as collision shape
    node.SetCollision(0, col)
    return node, rb

# Init
hg.AddAssetsFolder("assets_compiled")
hg.InputInit()
hg.WindowSystemInit()

res_x, res_y = 1280, 720
win = hg.RenderInit("Physics Test", res_x, res_y, hg.RF_VSync | hg.RF_MSAA4X)

pipeline = hg.CreateForwardPipeline()
res = hg.PipelineResources()

# physics debug
vtx_line_layout = hg.VertexLayoutPosFloatColorUInt8()
line_shader = hg.LoadProgramFromAssets("shaders/pos_rgb")

# create material
pbr_shader = hg.LoadPipelineProgramRefFromAssets("core/shader/pbr.hps", res, hg.GetForwardPipelineInfo())
mat_grey = hg.CreateMaterial(
    pbr_shader,
    "uBaseOpacityColor", hg.Vec4(1, 1, 1),
    "uOcclusionRoughnessMetalnessColor", hg.Vec4(1, 0.5, 0.05)
)

# create models
vtx_layout = hg.VertexLayoutPosFloatNormUInt8()

# cube
cube_size = hg.Vec3(1, 1, 1)
cube_ref = res.AddModel("cube", hg.CreateCubeModel(vtx_layout, cube_size.x, cube_size.y, cube_size.z))

# ground
ground_size = hg.Vec3(4, 0.05, 4)
ground_ref = res.AddModel("ground", hg.CreateCubeModel(vtx_layout, ground_size.x, ground_size.y, ground_size.z))

# setup the scene
scene = hg.Scene()

cam_mat = hg.TransformationMat4(hg.Vec3(0, 1.5, -5), hg.Vec3(hg.Deg(20), 0, 0))
cam = hg.CreateCamera(scene, cam_mat, 0.01, 1000)
view_matrix = hg.InverseFast(cam_mat)
c = cam.GetCamera()
projection_matrix = hg.ComputePerspectiveProjectionMatrix(
    c.GetZNear(), c.GetZFar(), hg.FovToZoomFactor(c.GetFov()), hg.Vec2(res_x / res_y, 1)
)

scene.SetCurrentCamera(cam)

lgt = hg.CreateLinearLight(
    scene,
    hg.TransformationMat4(hg.Vec3(0, 0, 0), hg.Vec3(hg.Deg(30), hg.Deg(30), 0)),
    hg.Color(1, 1, 1), hg.Color(1, 1, 1),
    10, hg.LST_Map, 0.0001, hg.Vec4(2, 4, 10, 16)
)

cube_node, _ = CreatePhysicCubeEx(scene, cube_size, hg.TranslationMat4(hg.Vec3(0, 0, 0)), cube_ref, [mat_grey], hg.RBT_Static, 0.0)

# scene physics
physics = hg.SceneBullet3Physics()
physics.SceneCreatePhysicsFromAssets(scene)
physics_step = hg.time_from_sec_f(1 / 60)
dt_frame_step = hg.time_from_sec_f(1 / 60)

clocks = hg.SceneClocks()

# description
hg.SetLogLevel(hg.LL_Normal)
print(">>> Description:\n>>> Set the position and rotation and Reset the World Matrix (same position and rotation) of a static cube in the rendering loop. The cube shall move from left to right and rotate on its Y axis.")

# main loop
keyboard = hg.Keyboard()

frame_count = 0

while not keyboard.Down(hg.K_Escape) and hg.IsWindowOpen(win):
    keyboard.Update()
    
    _pos = hg.Vec3((math.fmod(frame_count, 200.0) - 100.0) / 100.0, 0.0, 0.0)
    _rot = hg.Vec3(0.0, math.pi * frame_count / 360.0, 0.0)
    cube_node.GetTransform().SetPos(_pos)
    cube_node.GetTransform().SetRot(_rot)

    physics.NodeResetWorld(cube_node, hg.TransformationMat4(_pos, _rot))
    
    view_id = 0
    hg.SceneUpdateSystems(scene, clocks, dt_frame_step, physics, physics_step, 3)
    view_id, pass_id = hg.SubmitSceneToPipeline(view_id, scene, hg.IntRect(0, 0, res_x, res_y), True, pipeline, res)
    
    hg.SetViewClear(view_id, 0, 0, 1.0, 0)
    hg.SetViewRect(view_id, 0, 0, res_x, res_y)
    hg.SetViewTransform(view_id, view_matrix, projection_matrix)
    rs = hg.ComputeRenderState(hg.BM_Opaque, hg.DT_Disabled, hg.FC_Disabled)
    physics.RenderCollision(view_id, vtx_line_layout, line_shader, rs, 0)

    frame_count = frame_count + 1
    
    hg.Frame()
    hg.UpdateWindow(win)
    
scene.Clear()
scene.GarbageCollect()

hg.RenderShutdown()
hg.DestrouWindow(win)

hg.WindowSystemShutdown()
hg.InputShutdown()