From db072ad4dc181eca5a1458656b130beb43f475bf Mon Sep 17 00:00:00 2001
From: 53hornet <53hornet@gmail.com>
Date: Sat, 2 Feb 2019 23:33:15 -0500
Subject: Init.

---
 hw5/src/spotLightsource.cpp | 64 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 hw5/src/spotLightsource.cpp

(limited to 'hw5/src/spotLightsource.cpp')

diff --git a/hw5/src/spotLightsource.cpp b/hw5/src/spotLightsource.cpp
new file mode 100644
index 0000000..ab09636
--- /dev/null
+++ b/hw5/src/spotLightsource.cpp
@@ -0,0 +1,64 @@
+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#include <cmath>
+#include "constants.h"
+#include "spotLightsource.h"
+
+//////////////////
+// Constructors //
+//////////////////
+spotLightsource::spotLightsource(const vec3d& position, const vec3d& direction, float cutoffDegrees, float sharpness, const color& power, const vec3d& attenuation)
+{
+  _position = position;
+  _direction = normalize(direction);
+  _cutoff = cos(cutoffDegrees * PI / 180.0f);
+  _sharpness = sharpness;
+  _power = power;
+  _attenuation = attenuation;
+}
+
+
+/////////////
+// Methods //
+/////////////
+lightSample spotLightsource::intensityAt(const vec3d& point) const
+{
+  // HW5: Implement this. Computes the intensity from a spot
+  //      light source toward the 'point' taking in account
+  //      attenuation, cutoff angle, and sharpness.
+  // Modifies: nothing.
+  // Returns: light sample (pass 1) direction, 2) power/color
+  //          of the incident lighting, and 3) distance between
+  //          the light source and the point).
+  vec3d direction = (point - _position).normalize();
+  float dl_dot = direction.dot(_direction);
+  float distance = _position.distance(point);
+  color emittance;
+
+  if (dl_dot > _cutoff) {
+    emittance = _power * pow(dl_dot, _sharpness) / (
+                          _attenuation.x +
+                          _attenuation.y * distance +
+                          _attenuation.z * _position.squared_distance(point));
+  }
+  else {
+    emittance = color(0);
+  }
+
+  return lightSample(direction, emittance, distance);
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void spotLightsource::_print(std::ostream& s) const
+{
+  s << "Spot Lightsource: position=" << _position << ", direction=" << _direction << ", cutoff=" << (acos(_cutoff)*180.0f/PI) << ", sharpness=" << _sharpness << ", power=" << _power << ", attenuation=" << _attenuation;
+}
-- 
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