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How to use _cast method in autotest

Best Python code snippet using autotest_python
terraincast.py
Source:terraincast.py
1from ursina import *2from ursina import distance as ursina_distance3from math import inf4from ursina.hit_info import HitInfo5678def prepare_terrain(terrain, debug=False, calculate_normals=True):910    #does calculations that are needed for every terraincast check, and sets up the entities that manage transofrmations11    #has the option to calculate all face normals for the terrain (quicker while running, but takes time to initiate)1213    terrain._cast = Entity(parent=terrain,14                           model='sphere',15                           color=color.orange,16                           world_scale=0.1,17                           position=(0, 1, 0),18                           visible=debug,)19    if debug:20        terrain._cast.bound = Entity(parent=terrain,21                                     model='cube',22                                     color=color.rgba(255, 0, 0, 100))2324    terrain._cast.direction = Entity(parent=terrain,25                                     position=(0, 1, 0))2627    height_values = terrain.model.height_values2829    terrain._cast.width = terrain.model.width30    terrain._cast.depth = terrain.model.depth31    terrain._cast.aspect_ratio = terrain._cast.depth / terrain._cast.width3233    #correction_scale needed to account for cases where the other dimension is the smaller, so treated as 1 now34    if terrain._cast.depth < terrain._cast.width:35        terrain._cast.correction_scale = 1 / terrain._cast.aspect_ratio36    else:37        terrain._cast.correction_scale = 13839    terrain._cast.max = max([max(i) for i in height_values])40    terrain._cast.min = min([min(i) for i in height_values])4142    if calculate_normals:43        terrain._cast.prepared_height_values = []44        for scan_x, v in enumerate(height_values):45            row_to_add = []46            for scan_z, w in enumerate(v):47                quad_to_add = []48                for sub_face in [False, True]:49                    quad_to_add.append(_terraincast_get_plane(terrain, scan_x, scan_z, sub_face))50                row_to_add.append(quad_to_add)51            terrain._cast.prepared_height_values.append(row_to_add)525354def _terraincast_get_plane(terrain, scan_x, scan_z, sub_face):55    #gets details needed for each plane that makes up the terrain56    from numpy import cross57    height_values = terrain.model.height_values58    if scan_z == len(height_values[0]) - 1 and scan_x == len(height_values) - 1:59        start = Vec3(scan_x, height_values[scan_x][scan_z], scan_z)60        right = Vec3(scan_x + 1, height_values[scan_x][scan_z], scan_z)61        left = Vec3(scan_x, height_values[scan_x][scan_z], scan_z + 1)6263    elif scan_z == len(height_values[0]) - 1:64        start = Vec3(scan_x, height_values[scan_x][scan_z], scan_z)65        right = Vec3(scan_x, height_values[scan_x][scan_z], scan_z + 1)66        left = Vec3(scan_x + 1, height_values[scan_x + 1][scan_z], scan_z + 1)67        # print('edge')6869    elif scan_x == len(height_values) - 1:70        start = Vec3(scan_x, height_values[scan_x][scan_z], scan_z)71        right = Vec3(scan_x, height_values[scan_x][scan_z + 1], scan_z + 1)72        left = Vec3(scan_x + 1, height_values[scan_x][scan_z + 1], scan_z + 1)7374    elif sub_face:75        start = Vec3(scan_x, height_values[scan_x][scan_z], scan_z)76        right = Vec3(scan_x, height_values[scan_x][scan_z + 1], scan_z + 1)77        left = Vec3(scan_x + 1, height_values[scan_x + 1][scan_z + 1], scan_z + 1)7879    else:80        start = Vec3(scan_x, height_values[scan_x][scan_z], scan_z)81        right = Vec3(scan_x + 1, height_values[scan_x + 1][scan_z], scan_z)82        left = Vec3(scan_x + 1, height_values[scan_x + 1][scan_z + 1], scan_z + 1)8384    normal = cross(left - start, right - start)85    if normal[1] < 0:86        normal = - normal87    normal = normal.tolist()88    normal = Vec3(*normal).normalized()8990    return start, normal919293def terraincast(origin,94                terrain,95                direction=Vec3(0, -1, 0),96                distance=inf,97                iterations=inf,98                debug=False,99                calculate_normals=True,100                ):101    from numpy import dot102    origin = Vec3(*origin)103    direction = Vec3(*direction)104105    height_values = terrain.model.height_values106    current_iterations = 0107108    if not hasattr(terrain, "_cast"):109        prepare_terrain(terrain, debug, calculate_normals)110111    #transformations to make terraincast line up with model space, then "height_values grid" space112    terrain._cast.world_position = origin113    terrain._cast.position += terrain.origin114115    terrain._cast.direction.world_position = terrain.world_position + direction.normalized()116117    model_origin = terrain._cast.position118    model_origin[0] = model_origin[0] / terrain._cast.correction_scale119    model_origin[2] = model_origin[2] / terrain._cast.correction_scale120121    model_origin = model_origin + Vec3(0.5, 0, 0.5 * terrain._cast.aspect_ratio)122123    model_direction = terrain._cast.direction.position124    model_direction[1] = model_direction[1] * terrain._cast.correction_scale125126    #sets up scan information that iterates through the grid (height_values "grid" space essentially)127    scan_direction = Vec3(model_direction[0] * terrain._cast.width, model_direction[1],128                          model_direction[2] * terrain._cast.width)129    scan_tile = Vec3(model_origin[0] * terrain._cast.width, model_origin[1], model_origin[2] * terrain._cast.width)130    original_tile = Vec3(model_origin[0] * terrain._cast.width, model_origin[1], model_origin[2] * terrain._cast.width)131132    scan_max_distance = ursina_distance(Vec3(0, 0, 0), scan_direction) * distance133134    searching = True135    sub_face = False136137    # handle case where ray starts outside model138    x_scalar = 0139    y_scalar = 0140    z_scalar = 0141142    if scan_tile[0] < 0 and scan_direction[0] > 0:143        x_scalar = (0 - scan_tile[0]) / scan_direction[0]144    elif scan_tile[0] > len(height_values) and scan_direction[0] < 0:145        x_scalar = abs((scan_tile[0] - (len(height_values))) / scan_direction[0])146147    if scan_tile[2] < 0 and scan_direction[2] > 0:148        z_scalar = (0 - scan_tile[2]) / scan_direction[2]149    elif scan_tile[2] > len(height_values[0]) and scan_direction[2] < 0:150        z_scalar = abs((scan_tile[2] - (len(height_values[0]))) / scan_direction[2])151152    if scan_tile[1] < terrain._cast.min and scan_direction[1] > 0:153        y_scalar = (terrain._cast.min - scan_tile[1]) / scan_direction[1]154    elif scan_tile[1] > terrain._cast.max and scan_direction[1] < 0:155        y_scalar = abs((scan_tile[1] - terrain._cast.max) / scan_direction[1])156157    scan_tile += scan_direction * max([x_scalar, y_scalar, z_scalar])158159    #main loop through grid160    while searching:161162        #determines indexes required from grid163        scan_x = int(floor(scan_tile[0]))164        scan_z = int(floor(scan_tile[2]))165        if scan_tile[0] == scan_x and scan_direction[0] < 0:166            scan_x -= 1167            scan_x = max(scan_x, 0)168169        if scan_tile[2] == scan_z and scan_direction[2] < 0:170            scan_z -= 1171            scan_z = max(scan_z, 0)172173        current_iterations += 1174175        #failure cases176        if current_iterations == iterations:177            searching = False178        elif scan_x >= len(height_values):179            searching = False180        elif scan_z >= len(height_values[0]):181            searching = False182        elif scan_x < 0:183            searching = False184        elif scan_z < 0:185            searching = False186        elif scan_tile[1] > terrain._cast.max + 1:187            searching = False188        elif scan_tile[1] < terrain._cast.min - 1:189            searching = False190        elif ursina_distance(scan_tile, original_tile) > scan_max_distance:191            searching = False192193        if not searching:194            break195196        if calculate_normals:197            start, normal = terrain._cast.prepared_height_values[scan_x][scan_z][sub_face]198        else:199            start, normal = _terraincast_get_plane(terrain, scan_x, scan_z, sub_face)200201        bottom_dot = dot(scan_direction, normal)202        top_dot = dot(start - original_tile, normal)203        if bottom_dot != 0:204            magnitude = top_dot / bottom_dot205        elif top_dot == 0:206            magnitude = 0207        else:208            magnitude = None209210        if magnitude is not None:211            point = original_tile + magnitude * scan_direction212        else:213            magnitude = 0214            point = Vec3(scan_x + 2, 0, scan_z + 2)215216        in_front = magnitude >= 0217        correct_sub_triangle = (point[0] % 1 <= point[2] % 1) == sub_face or point[0] % 1 == point[2] % 1218        x_tolerance = abs(point[0] - scan_x - 0.5) <= 0.5219        z_tolerance = abs(point[2] - scan_z - 0.5) <= 0.5220        #success case221        if in_front and correct_sub_triangle and x_tolerance and z_tolerance:222            break223224        elif sub_face:225            # works out next "tile" to move to226            if scan_direction[0] > 0:227                x_scalar = (1 - scan_tile[0] % 1) / scan_direction[0]228            elif scan_direction[0] < 0:229                corrected = (-scan_tile[0]) % 1230                x_scalar = abs((1 - corrected) / scan_direction[0])231            else:232                x_scalar = None233234            if scan_direction[2] > 0:235                z_scalar = (1 - scan_tile[2] % 1) / scan_direction[2]236            elif scan_direction[2] < 0:237                corrected = (-scan_tile[2]) % 1238                z_scalar = abs((1 - corrected) / scan_direction[2])239            else:240                z_scalar = None241242            if x_scalar is not None and (z_scalar is None or x_scalar < z_scalar):243                scan_tile += x_scalar * scan_direction244            elif z_scalar is not None:245                scan_tile += z_scalar * scan_direction246            else:247                searching = False248                break249250        sub_face = not sub_face251252    if debug:253        #generates bounding box254        l = -0.5 * terrain._cast.correction_scale - terrain.origin[0]255        r = 0.5 * terrain._cast.correction_scale - terrain.origin[0]256257        f = 0.5 * terrain._cast.aspect_ratio * terrain._cast.correction_scale - terrain.origin[2]258        b = -0.5 * terrain._cast.aspect_ratio * terrain._cast.correction_scale - terrain.origin[2]259260        u = terrain._cast.max - terrain.origin[1]261        d = terrain._cast.min - terrain.origin[1]262263        verts = (264            Vec3(l, d, b), Vec3(r, d, b), Vec3(r, u, b), Vec3(l, u, b),265            Vec3(l, d, f), Vec3(r, d, f), Vec3(r, u, f), Vec3(l, u, f)266        )267268        tris = (269            (0, 1, 2, 3), (5, 4, 7, 6),  # forward, back270            (3, 2, 6, 7), (4, 5, 1, 0),  # up, down271            (1, 5, 6, 2), (4, 0, 3, 7)  # right, left272        )273        cube = Mesh(verts, tris)274        terrain._cast.bound.model = cube275        terrain._cast.bound.model.generate()276    if searching:277        #geneartess hit info and undoes some transformations278        point = Vec3(point[0] / terrain._cast.width,279                     point[1],280                     point[2] / terrain._cast.width)281282        point -= Vec3(0.5, 0, 0.5 * terrain._cast.aspect_ratio)283284        point[0] = point[0] * terrain._cast.correction_scale285        point[2] = point[2] * terrain._cast.correction_scale286        terrain._cast.position = point287        terrain._cast.position -= terrain.origin288289        terrain._cast.visible = debug290291        terrain._cast.direction.position = normal / terrain._cast.correction_scale292293        hit = HitInfo(hit=True)294        hit.point = point295        hit.world_point = terrain._cast.world_position296297        hit.normal = Vec3(*normal)298        hit.world_normal = terrain._cast.direction.world_position - terrain.world_position299        hit.distance = ursina_distance(origin, hit.world_point)300        hit.entity = terrain301        hit.entities = [terrain, ]302        hit.hits = [True, ]303        if hit.distance > distance:304            hit = HitInfo(hit=False)305        return hit306    else:307        terrain._cast.visible = False308309        hit = HitInfo(hit=False)310        return hit311312313if __name__ == '__main__':314    app = Ursina()315316    terrainEntity = Entity(model=Terrain('heightmap_1', skip=8),317                           scale=(20, 5, 20),318                           rotation=(30, 40, 50),319                           origin=(1, 1, 1),320                           texture='heightmap_1')321322    hit_entity = Entity(model='sphere', scale=0.1)323    EditorCamera()324325326    def update():327        hit = terraincast(camera.world_position, terrainEntity, direction=camera.forward, debug=True)328        if hit:329            hit_entity.position = hit.world_point + hit.world_normal330331            hit.entity.rotation_y += 2*time.dt332333    Sky()
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