examples/scene_caustics.xml

@@ -0,0 +1,65 @@
+<cycles>
+
+<integrator
+    caustics_reflective="true"
+    caustics_refractive="true"
+/>
+
+<!--Camera-->
+<transform
+    rotate="65.75944715 0.93999645 0.10960667 0.32309913"
+    translate="3 -12 5"
+    scale="1 1 -1" >
+    <camera
+        type="perspective"
+        fov="0.78539819"
+        full_width="800"
+        full_height="600"
+    />
+</transform>
+
+<!--PointLight-->
+<shader name="PointLight_shader">
+<emission
+    name="PointLight_emit"
+    color="1.0 1.0 1.0"
+    strength="1000"
+/>
+<connect from="PointLight_emit emission" to="output surface"/>
+</shader>
+<state shader="PointLight_shader">
+<light
+    name="PointLight"
+    light_type="point"
+    strength="1 1 1"
+    tfm="1 0 0 4  0 1 0 0  0 0 1 4"
+    use_caustics="true"
+/>
+</state>
+
+<!--Suzanne-->
+<shader name="Suzanne">
+<glass_bsdf name="Suzanne_bsdf" IOR="1.5" color="1.0 1.0 1.0" />
+<connect from="Suzanne_bsdf bsdf" to="output surface"/>
+</shader>
+<transform
+  rotate="90.0  0.0 0.0 1.0"
+  translate="0.0 0.0 1.0"
+>
+<object name="Suzanne" is_caustics_caster="true"/>
+<state interpolation="smooth" shader="Suzanne" object="Suzanne">
+  <include src="objects/suzanne.xml"/>
+</state>
+</transform>
+
+<!--Ground-->
+<shader name="Ground">
+<diffuse_bsdf name="Ground_bsdf" color="0.60 0.60 0.60"/>
+<connect from="Ground_bsdf bsdf" to="output surface"/>
+</shader>
+<object name="Ground" is_caustics_receiver="true" />
+<state interpolation="smooth" shader="Ground" object="Ground">
+<mesh P="-6 6 0  6 6 0  6 -6 0  -6 -6 0" nverts="4" verts="0 1 2 3" />
+</state>
+
+</cycles>

src/app/cycles_xml.cpp

@@ -46,8 +46,9 @@ struct XMLReadState : public XMLReader {
   Shader *shader;    /* Current shader. */
   string base;       /* Base path to current file. */
   float dicing_rate; /* Current dicing rate. */
+  Object *object;    /* Current object. */
 
-  XMLReadState() : scene(NULL), smooth(false), shader(NULL), dicing_rate(1.0f)
+  XMLReadState() : scene(NULL), smooth(false), shader(NULL), dicing_rate(1.0f), object(NULL)
   {
     tfm = transform_identity();
   }
@@ -405,9 +406,16 @@ static void xml_read_background(XMLReadState &state, xml_node node)
 
 /* Mesh */
 
-static Mesh *xml_add_mesh(Scene *scene, const Transform &tfm)
+static Mesh *xml_add_mesh(Scene *scene, const Transform &tfm, Object *object)
 {
-  /* create mesh */
+  if (object && object->get_geometry()->is_mesh()) {
+    /* Use existing object and mesh */
+    object->set_tfm(tfm);
+    Geometry *geometry = object->get_geometry();
+    return static_cast<Mesh *>(geometry);
+  }
+  else {
+    /* Create mesh */
     Mesh *mesh = new Mesh();
     scene->geometry.push_back(mesh);
 
@@ -418,12 +426,13 @@ static Mesh *xml_add_mesh(Scene *scene, const Transform &tfm)
     scene->objects.push_back(object);
 
     return mesh;
+  }
 }
 
 static void xml_read_mesh(const XMLReadState &state, xml_node node)
 {
   /* add mesh */
-  Mesh *mesh = xml_add_mesh(state.scene, state.tfm);
+  Mesh *mesh = xml_add_mesh(state.scene, state.tfm, state.object);
   array<Node *> used_shaders = mesh->get_used_shaders();
   used_shaders.push_back_slow(state.shader);
   mesh->set_used_shaders(used_shaders);
@@ -613,7 +622,7 @@ static void xml_read_transform(xml_node node, Transform &tfm)
 
 static void xml_read_state(XMLReadState &state, xml_node node)
 {
-  /* read shader */
+  /* Read shader */
   string shadername;
 
   if (xml_read_string(&shadername, node, "shader")) {
@@ -632,6 +641,25 @@ static void xml_read_state(XMLReadState &state, xml_node node)
     }
   }
 
+  /* Read object */
+  string objectname;
+
+  if (xml_read_string(&objectname, node, "object")) {
+    bool found = false;
+
+    foreach (Object *object, state.scene->objects) {
+      if (object->name == objectname) {
+        state.object = object;
+        found = true;
+        break;
+      }
+    }
+
+    if (!found) {
+      fprintf(stderr, "Unknown object \"%s\".\n", objectname.c_str());
+    }
+  }
+
   xml_read_float(&state.dicing_rate, node, "dicing_rate");
 
   /* read smooth/flat */
@@ -643,6 +671,26 @@ static void xml_read_state(XMLReadState &state, xml_node node)
   }
 }
 
+/* Object */
+
+static void xml_read_object(XMLReadState &state, xml_node node)
+{
+  Scene *scene = state.scene;
+
+  /* create mesh */
+  Mesh *mesh = new Mesh();
+  scene->geometry.push_back(mesh);
+
+  /* create object */
+  Object *object = new Object();
+  object->set_geometry(mesh);
+  object->set_tfm(state.tfm);
+
+  xml_read_node(state, object, node);
+
+  scene->objects.push_back(object);
+}
+
 /* Scene */
 
 static void xml_read_include(XMLReadState &state, const string &src);
@@ -690,6 +738,12 @@ static void xml_read_scene(XMLReadState &state, xml_node scene_node)
         xml_read_include(state, src);
       }
     }
+    else if (string_iequals(node.name(), "object")) {
+      XMLReadState substate = state;
+
+      xml_read_object(substate, node);
+      xml_read_scene(substate, node);
+    }
 #ifdef WITH_ALEMBIC
     else if (string_iequals(node.name(), "alembic")) {
       xml_read_alembic(state, node);