Light dir + shadow Proj

gistfile1.txt

const q = this._hoverEffect.$viewManager.active._components.lights._directionalLight.shadow.camera.quaternion
const v = vector3.set(0, 0, -1).applyQuaternion(q)
this.helper.setDirection(v)
this._mesh.material.uniforms.uLightDirection.value.copy(v)


// Implementation from https://gist.github.com/TimSC/8c25ca941d614bf48ebba6b473747d72
vec3 projectToGround(vec3 planeNormal, vec3 planePoint, vec3 rayDirection, vec3 rayPoint ) {
    float epsilon=0.000001;

    float ndotu = dot(planeNormal, rayDirection);
    vec3 w = rayPoint - planePoint;
    float si = -dot(planeNormal, w) / ndotu;
    vec3 Psi = w + si * rayDirection + planePoint;
    return Psi;
}


vec4 worldPosition = modelMatrix * vec4(position, 1.0);
vec4 projectedPosition = vec4(projectToGround(vec3(0., 1., 0.), vec3(0., 0., 0.), uLightDirection, worldPosition.xyz), worldPosition.w);
projectedPosition.y += 0.01;
gl_Position = projectionMatrix * viewMatrix * projectedPosition;