Ray Casting

See also

dhart.geometry

In this example we cast an individual ray into a plane that was loaded from an OBJ file.

from dhart.geometry import LoadOBJ, CommonRotations
from dhart.raytracer import (EmbreeBVH,Intersect,
                                        IntersectForPoint,
                                        IntersectOccluded)
import dhart

# Get model path
obj_path = dhart.get_sample_model('plane.obj')
# Load mesh
loaded_obj = LoadOBJ(obj_path, rotation=CommonRotations.Yup_to_Zup)
# Create BVH
bvh = EmbreeBVH(loaded_obj)

# Define point to start ray
p1 = (0, 0, 2)
# Define direction to cast ray
dir = (0, 0, -1)

# Cast a ray for the hitpoint
hit_point = IntersectForPoint(bvh, p1, dir, -1)
print(f"Hit point: {hit_point}")

# Cast a ray for distance/meshid
distance, mesh_id = Intersect(bvh, p1, dir, -1)
print(f"distance is {distance}, meshid is {mesh_id}")

# See if it occludes
does_occlude = IntersectOccluded(bvh, p1, (0, 0, -1), 9999)
print(f"Does the ray connect? {does_occlude}")

Hit point: (0.0, 0.0, 0.0)
distance is 2.0, meshid is 0
Does the ray connect? True