glm::vec3 Camera::pickAgainstPlane(float x, float y, const glm::vec4& plane) const {
int width = 0, height = 0;
glfwGetWindowSize(glfwGetCurrentContext(), &width, &height);
glm::vec3 screenPos(x / width * 2 - 1, (y / height * 2 - 1) * -1, -1);
screenPos.x /= m_projection[0][0];
screenPos.y /= m_projection[1][1];
glm::vec3 dir = glm::normalize(m_transform * glm::vec4(screenPos, 0)).xyz();
float d = (plane.w - glm::dot(m_transform[3].xyz(), plane.xyz()) / glm::dot(dir, plane.xyz()));
return m_transform[3].xyz() + dir * d;
}
glm::vec3 Camera::PickAgainstPlane(float x, float y, const glm::vec4& _plane) {
int width = 0;
int height = 0;
glfwGetWindowSize(glfwGetCurrentContext(), &width, &height);
glm::vec3 screenPos(x / width * 2 - 1, (y / height * 2 - 1) * -1, -1);
screenPos.x /= m_projectionTransform[0][0];
screenPos.y /= m_projectionTransform[1][1];
glm::vec3 dir = glm::normalize(m_worldTransform * glm::vec4(screenPos, 0)).xyz();
float d = (_plane.w - glm::dot(m_worldTransform[3].xyz(), _plane.xyz()) / glm::dot(dir, _plane.xyz()));
if (d >= 0) {
return m_worldTransform[3].xyz() + dir * d;
} else {
return glm::vec3(0);
}
}