Camera.cpp

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#include "Camera.h"
 
namespace dyno
{
    TRay3D<float> Camera::castRayInWorldSpace(float x, float y) 
    {
        float width = this->viewportWidth();
        float height = this->viewportHeight();
 
        glm::mat4 projMat = this->getProjMat();
        glm::mat4 viewMat = this->getViewMat();
        float dx = (2.0f * x) / width - 1.0f;
        float dy = 1.0f - (2.0f * y) / height;
        float dz = 0.95;
 
        glm::mat4 mv = glm::inverse(projMat*viewMat);
 
        glm::vec4 near = glm::vec4(dx, dy, -1, 1.0);
        glm::vec4 far = glm::vec4(dx, dy, 1, 1.0);
 
        glm::vec4 near_world = mv * near;
        glm::vec4 far_world = mv * far;
    
        if (near_world.w != 0.0)
        {
            near_world /= near_world.w;
        }
 
        if (far_world.w != 0.0)
        {
            far_world /= far_world.w;
        }
 
        TRay3D<float> ray;
        ray.origin = Vec3f(near_world.x, near_world.y, near_world.z);
        ray.direction = Vec3f(far_world.x - near_world.x, far_world.y - near_world.y, far_world.z - near_world.z).normalize();
 
        return ray;
    }
}