_ray_cylinder_8h_source.html 25 KB

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  106. <div class="headertitle"><div class="title">RayCylinder.h</div></div>
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  108. <div class="contents">
  109. <a href="_ray_cylinder_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)</span></div>
  110. <div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// SPDX-FileCopyrightText: 2021 Jorrit Rouwe</span></div>
  111. <div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">// SPDX-License-Identifier: MIT</span></div>
  112. <div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
  113. <div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#pragma once</span></div>
  114. <div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
  115. <div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;<a class="code" href="_find_root_8h.html">Jolt/Math/FindRoot.h</a>&gt;</span></div>
  116. <div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> </div>
  117. <div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><a class="code hl_define" href="_core_8h.html#ad14098b68b8c44ea6112601031268405">JPH_NAMESPACE_BEGIN</a></div>
  118. <div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
  119. <div class="foldopen" id="foldopen00017" data-start="{" data-end="}">
  120. <div class="line"><a id="l00017" name="l00017"></a><span class="lineno"><a class="line" href="_ray_cylinder_8h.html#a73e90eb1e3af7294c5b0248ddf7d1317"> 17</a></span>JPH_INLINE <span class="keywordtype">float</span> <a class="code hl_function" href="_ray_cylinder_8h.html#a73e90eb1e3af7294c5b0248ddf7d1317">RayCylinder</a>(<a class="code hl_class" href="class_vec3.html">Vec3Arg</a> inRayOrigin, <a class="code hl_class" href="class_vec3.html">Vec3Arg</a> inRayDirection, <span class="keywordtype">float</span> inCylinderRadius)</div>
  121. <div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span>{</div>
  122. <div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// Remove Y component of ray to see of ray intersects with infinite cylinder</span></div>
  123. <div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <a class="code hl_class" href="class_u_vec4.html">UVec4</a> mask_y = <a class="code hl_class" href="class_u_vec4.html">UVec4</a>(0, 0xffffffff, 0, 0);</div>
  124. <div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> <a class="code hl_class" href="class_vec3.html">Vec3</a> origin_xz = <a class="code hl_function" href="class_vec3.html#ae0f4ab3438fe6b9782010ef8212a6d69">Vec3::sSelect</a>(inRayOrigin, <a class="code hl_function" href="class_vec3.html#ad03c52ab27761bc1e64e33c47632ba51">Vec3::sZero</a>(), mask_y);</div>
  125. <div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> <span class="keywordtype">float</span> origin_xz_len_sq = origin_xz.<a class="code hl_function" href="class_vec3.html#aba501a6a474028084799f871c9083dc1">LengthSq</a>();</div>
  126. <div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keywordtype">float</span> r_sq = <a class="code hl_function" href="_math_8h.html#a61379b8b743a16fe823daeebc1482570">Square</a>(inCylinderRadius);</div>
  127. <div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="keywordflow">if</span> (origin_xz_len_sq &gt; r_sq)</div>
  128. <div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> {</div>
  129. <div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// Ray starts outside of the infinite cylinder</span></div>
  130. <div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// Solve: |RayOrigin_xz + fraction * RayDirection_xz|^2 = r^2 to find fraction</span></div>
  131. <div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <a class="code hl_class" href="class_vec3.html">Vec3</a> direction_xz = <a class="code hl_function" href="class_vec3.html#ae0f4ab3438fe6b9782010ef8212a6d69">Vec3::sSelect</a>(inRayDirection, <a class="code hl_function" href="class_vec3.html#ad03c52ab27761bc1e64e33c47632ba51">Vec3::sZero</a>(), mask_y);</div>
  132. <div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordtype">float</span> a = direction_xz.<a class="code hl_function" href="class_vec3.html#aba501a6a474028084799f871c9083dc1">LengthSq</a>();</div>
  133. <div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">float</span> b = 2.0f * origin_xz.<a class="code hl_function" href="class_vec3.html#a0e078ff09f69e669db71a2b0e37939ff">Dot</a>(direction_xz);</div>
  134. <div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordtype">float</span> c = origin_xz_len_sq - r_sq;</div>
  135. <div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordtype">float</span> fraction1, fraction2;</div>
  136. <div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="_find_root_8h.html#a3bec219d038a3c84a22b1c07b49b9eca">FindRoot</a>(a, b, c, fraction1, fraction2) == 0)</div>
  137. <div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">return</span> FLT_MAX; <span class="comment">// No intersection with infinite cylinder</span></div>
  138. <div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div>
  139. <div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// Get fraction corresponding to the ray entering the circle</span></div>
  140. <div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordtype">float</span> fraction = min(fraction1, fraction2);</div>
  141. <div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">if</span> (fraction &gt;= 0.0f)</div>
  142. <div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keywordflow">return</span> fraction;</div>
  143. <div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
  144. <div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordflow">else</span></div>
  145. <div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> {</div>
  146. <div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// Ray starts inside the infinite cylinder</span></div>
  147. <div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">return</span> 0.0f;</div>
  148. <div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> }</div>
  149. <div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
  150. <div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// No collision</span></div>
  151. <div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> FLT_MAX;</div>
  152. <div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>}</div>
  153. </div>
  154. <div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
  155. <div class="foldopen" id="foldopen00057" data-start="{" data-end="}">
  156. <div class="line"><a id="l00057" name="l00057"></a><span class="lineno"><a class="line" href="_ray_cylinder_8h.html#a273dc91d43f5a44d0a1c6af044a70c0e"> 57</a></span>JPH_INLINE <span class="keywordtype">float</span> <a class="code hl_function" href="_ray_cylinder_8h.html#a73e90eb1e3af7294c5b0248ddf7d1317">RayCylinder</a>(<a class="code hl_class" href="class_vec3.html">Vec3Arg</a> inRayOrigin, <a class="code hl_class" href="class_vec3.html">Vec3Arg</a> inRayDirection, <span class="keywordtype">float</span> inCylinderHalfHeight, <span class="keywordtype">float</span> inCylinderRadius)</div>
  157. <div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span>{</div>
  158. <div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// Test infinite cylinder</span></div>
  159. <div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">float</span> fraction = <a class="code hl_function" href="_ray_cylinder_8h.html#a73e90eb1e3af7294c5b0248ddf7d1317">RayCylinder</a>(inRayOrigin, inRayDirection, inCylinderRadius);</div>
  160. <div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">if</span> (fraction == FLT_MAX)</div>
  161. <div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">return</span> FLT_MAX;</div>
  162. <div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
  163. <div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// If this hit is in the finite cylinder we have our fraction</span></div>
  164. <div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">if</span> (abs(inRayOrigin.<a class="code hl_function" href="class_vec3.html#aac08ebd63b9ab4fa089a5ed3224a8679">GetY</a>() + fraction * inRayDirection.<a class="code hl_function" href="class_vec3.html#aac08ebd63b9ab4fa089a5ed3224a8679">GetY</a>()) &lt;= inCylinderHalfHeight)</div>
  165. <div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">return</span> fraction;</div>
  166. <div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> </div>
  167. <div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// Check if ray could hit the top or bottom plane of the cylinder</span></div>
  168. <div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">float</span> direction_y = inRayDirection.<a class="code hl_function" href="class_vec3.html#aac08ebd63b9ab4fa089a5ed3224a8679">GetY</a>();</div>
  169. <div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">if</span> (direction_y != 0.0f)</div>
  170. <div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> {</div>
  171. <div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// Solving line equation: x = ray_origin + fraction * ray_direction</span></div>
  172. <div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// and plane equation: plane_normal . x + plane_constant = 0</span></div>
  173. <div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// fraction = (-plane_constant - plane_normal . ray_origin) / (plane_normal . ray_direction)</span></div>
  174. <div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// when the ray_direction.y &lt; 0:</span></div>
  175. <div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// plane_constant = -cylinder_half_height, plane_normal = (0, 1, 0)</span></div>
  176. <div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// else</span></div>
  177. <div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// plane_constant = -cylinder_half_height, plane_normal = (0, -1, 0)</span></div>
  178. <div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">float</span> origin_y = inRayOrigin.<a class="code hl_function" href="class_vec3.html#aac08ebd63b9ab4fa089a5ed3224a8679">GetY</a>();</div>
  179. <div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordtype">float</span> plane_fraction;</div>
  180. <div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordflow">if</span> (direction_y &lt; 0.0f)</div>
  181. <div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> plane_fraction = (inCylinderHalfHeight - origin_y) / direction_y;</div>
  182. <div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">else</span></div>
  183. <div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> plane_fraction = -(inCylinderHalfHeight + origin_y) / direction_y;</div>
  184. <div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
  185. <div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// Check if the hit is in front of the ray</span></div>
  186. <div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">if</span> (plane_fraction &gt;= 0.0f)</div>
  187. <div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> {</div>
  188. <div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// Test if this hit is inside the cylinder</span></div>
  189. <div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <a class="code hl_class" href="class_vec3.html">Vec3</a> point = inRayOrigin + plane_fraction * inRayDirection;</div>
  190. <div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordtype">float</span> dist_sq = <a class="code hl_function" href="_math_8h.html#a61379b8b743a16fe823daeebc1482570">Square</a>(point.<a class="code hl_function" href="class_vec3.html#a284e29f161ae7709a934f402bd2a848c">GetX</a>()) + <a class="code hl_function" href="_math_8h.html#a61379b8b743a16fe823daeebc1482570">Square</a>(point.<a class="code hl_function" href="class_vec3.html#aeca36d050a7c2b41d3ac0438874d8c60">GetZ</a>());</div>
  191. <div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="keywordflow">if</span> (dist_sq &lt;= <a class="code hl_function" href="_math_8h.html#a61379b8b743a16fe823daeebc1482570">Square</a>(inCylinderRadius))</div>
  192. <div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keywordflow">return</span> plane_fraction;</div>
  193. <div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> }</div>
  194. <div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> }</div>
  195. <div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
  196. <div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="comment">// No collision</span></div>
  197. <div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keywordflow">return</span> FLT_MAX;</div>
  198. <div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>}</div>
  199. </div>
  200. <div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
  201. <div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><a class="code hl_define" href="_core_8h.html#a73da8725998b00321a9db341202d650d">JPH_NAMESPACE_END</a></div>
  202. <div class="ttc" id="a_core_8h_html_a73da8725998b00321a9db341202d650d"><div class="ttname"><a href="_core_8h.html#a73da8725998b00321a9db341202d650d">JPH_NAMESPACE_END</a></div><div class="ttdeci">#define JPH_NAMESPACE_END</div><div class="ttdef"><b>Definition</b> Core.h:425</div></div>
  203. <div class="ttc" id="a_core_8h_html_ad14098b68b8c44ea6112601031268405"><div class="ttname"><a href="_core_8h.html#ad14098b68b8c44ea6112601031268405">JPH_NAMESPACE_BEGIN</a></div><div class="ttdeci">#define JPH_NAMESPACE_BEGIN</div><div class="ttdef"><b>Definition</b> Core.h:419</div></div>
  204. <div class="ttc" id="a_find_root_8h_html"><div class="ttname"><a href="_find_root_8h.html">FindRoot.h</a></div></div>
  205. <div class="ttc" id="a_find_root_8h_html_a3bec219d038a3c84a22b1c07b49b9eca"><div class="ttname"><a href="_find_root_8h.html#a3bec219d038a3c84a22b1c07b49b9eca">FindRoot</a></div><div class="ttdeci">JPH_NAMESPACE_BEGIN int FindRoot(const T inA, const T inB, const T inC, T &amp;outX1, T &amp;outX2)</div><div class="ttdef"><b>Definition</b> FindRoot.h:13</div></div>
  206. <div class="ttc" id="a_math_8h_html_a61379b8b743a16fe823daeebc1482570"><div class="ttname"><a href="_math_8h.html#a61379b8b743a16fe823daeebc1482570">Square</a></div><div class="ttdeci">JPH_INLINE constexpr T Square(T inV)</div><div class="ttdoc">Square a value.</div><div class="ttdef"><b>Definition</b> Math.h:55</div></div>
  207. <div class="ttc" id="a_ray_cylinder_8h_html_a73e90eb1e3af7294c5b0248ddf7d1317"><div class="ttname"><a href="_ray_cylinder_8h.html#a73e90eb1e3af7294c5b0248ddf7d1317">RayCylinder</a></div><div class="ttdeci">JPH_NAMESPACE_BEGIN JPH_INLINE float RayCylinder(Vec3Arg inRayOrigin, Vec3Arg inRayDirection, float inCylinderRadius)</div><div class="ttdef"><b>Definition</b> RayCylinder.h:17</div></div>
  208. <div class="ttc" id="aclass_u_vec4_html"><div class="ttname"><a href="class_u_vec4.html">UVec4</a></div><div class="ttdef"><b>Definition</b> UVec4.h:12</div></div>
  209. <div class="ttc" id="aclass_vec3_html"><div class="ttname"><a href="class_vec3.html">Vec3</a></div><div class="ttdef"><b>Definition</b> Vec3.h:17</div></div>
  210. <div class="ttc" id="aclass_vec3_html_a0e078ff09f69e669db71a2b0e37939ff"><div class="ttname"><a href="class_vec3.html#a0e078ff09f69e669db71a2b0e37939ff">Vec3::Dot</a></div><div class="ttdeci">JPH_INLINE float Dot(Vec3Arg inV2) const</div><div class="ttdoc">Dot product.</div><div class="ttdef"><b>Definition</b> Vec3.inl:650</div></div>
  211. <div class="ttc" id="aclass_vec3_html_a284e29f161ae7709a934f402bd2a848c"><div class="ttname"><a href="class_vec3.html#a284e29f161ae7709a934f402bd2a848c">Vec3::GetX</a></div><div class="ttdeci">JPH_INLINE float GetX() const</div><div class="ttdoc">Get individual components.</div><div class="ttdef"><b>Definition</b> Vec3.h:127</div></div>
  212. <div class="ttc" id="aclass_vec3_html_aac08ebd63b9ab4fa089a5ed3224a8679"><div class="ttname"><a href="class_vec3.html#aac08ebd63b9ab4fa089a5ed3224a8679">Vec3::GetY</a></div><div class="ttdeci">JPH_INLINE float GetY() const</div><div class="ttdef"><b>Definition</b> Vec3.h:128</div></div>
  213. <div class="ttc" id="aclass_vec3_html_aba501a6a474028084799f871c9083dc1"><div class="ttname"><a href="class_vec3.html#aba501a6a474028084799f871c9083dc1">Vec3::LengthSq</a></div><div class="ttdeci">JPH_INLINE float LengthSq() const</div><div class="ttdoc">Squared length of vector.</div><div class="ttdef"><b>Definition</b> Vec3.inl:666</div></div>
  214. <div class="ttc" id="aclass_vec3_html_ad03c52ab27761bc1e64e33c47632ba51"><div class="ttname"><a href="class_vec3.html#ad03c52ab27761bc1e64e33c47632ba51">Vec3::sZero</a></div><div class="ttdeci">static JPH_INLINE Vec3 sZero()</div><div class="ttdoc">Vector with all zeros.</div><div class="ttdef"><b>Definition</b> Vec3.inl:103</div></div>
  215. <div class="ttc" id="aclass_vec3_html_ae0f4ab3438fe6b9782010ef8212a6d69"><div class="ttname"><a href="class_vec3.html#ae0f4ab3438fe6b9782010ef8212a6d69">Vec3::sSelect</a></div><div class="ttdeci">static JPH_INLINE Vec3 sSelect(Vec3Arg inNotSet, Vec3Arg inSet, UVec4Arg inControl)</div><div class="ttdoc">Component wise select, returns inNotSet when highest bit of inControl = 0 and inSet when highest bit ...</div><div class="ttdef"><b>Definition</b> Vec3.inl:270</div></div>
  216. <div class="ttc" id="aclass_vec3_html_aeca36d050a7c2b41d3ac0438874d8c60"><div class="ttname"><a href="class_vec3.html#aeca36d050a7c2b41d3ac0438874d8c60">Vec3::GetZ</a></div><div class="ttdeci">JPH_INLINE float GetZ() const</div><div class="ttdef"><b>Definition</b> Vec3.h:129</div></div>
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