How can I find the location (x,y,z) of the ray reflection in MATLAB?!

Hi

How can I find the location (x,y,z) of the ray reflection (break) in MATLAB?! I want to find the point of reflection that happend on a wall.

Thanks

Answer 1

[Pratyush]

Hi Parmi,

I understand that you have defined a wall and an incident ray and you want to find the point of incidence on the wall.

To find the location of ray reflection on a wall in MATLAB, you can use the geometric properties of the wall and the incident ray. Here's a step-by-step approach to calculate the reflection point (x, y, z):

1. Define the wall: Specify the wall's geometry, such as its position, orientation, and dimensions. For simplicity, let's assume the wall is a flat surface parallel to the x-y plane.
2. Define the incident ray: Specify the properties of the incident ray, such as its starting point (x0, y0, z0) and direction vector (dx, dy, dz).
3. Calculate the intersection point: Find the intersection point between the incident ray and the wall. To do this, you can solve the parametric equations of the ray and the wall plane simultaneously. The equation of the wall plane can be defined as Ax + By + Cz + D = 0, where A, B, C, and D are coefficients determined by the wall's properties.
4. Check if the intersection point is valid: Ensure that the intersection point lies within the boundaries of the wall. If it does not, then the ray does not hit the wall.
5. Calculate the reflection point: Compute the reflection point by reflecting the intersection point across the wall's surface. The reflection can be calculated using the law of reflection, which states that the angle of incidence is equal to the angle of reflection.

Here's a sample MATLAB code snippet to demonstrate the calculation of the reflection point:

% Wall properties
wallPosition = [x_wall, y_wall, z_wall]; % Position of the wall
wallNormal = [nx, ny, nz]; % Normal vector of the wall

% Incident ray properties
rayStart = [x0, y0, z0]; % Starting point of the ray
rayDirection = [dx, dy, dz]; % Direction vector of the ray

% Calculate intersection point
t = dot(wallNormal, wallPosition - rayStart) / dot(wallNormal, rayDirection);
intersectionPoint = rayStart + t * rayDirection;

% Check if intersection point is valid
if intersectionPoint(1) < x_min || intersectionPoint(1) > x_max || ...
   intersectionPoint(2) < y_min || intersectionPoint(2) > y_max || ...
   intersectionPoint(3) < z_min || intersectionPoint(3) > z_max
    disp('Ray does not hit the wall.');
    return;
end

% Calculate reflection point
reflectionPoint = intersectionPoint - 2 * dot(intersectionPoint - wallPosition, wallNormal) * wallNormal;

% Display the reflection point
disp(['Reflection point: (', num2str(reflectionPoint(1)), ', ', num2str(reflectionPoint(2)), ', ', num2str(reflectionPoint(3)), ')']);

Here I am assuming that 'x_wall', 'y_wall', 'z_wall', 'nx', 'ny', 'nz', 'x0', 'y0', 'z0', 'dx', 'dy', 'dz', 'x_min', 'x_max', 'y_min', 'y_max', 'z_min', and 'z_max'are assigned with the appropriate values for your specific scenario.