Added billboarding example for sprites and particle fx. (#155)

Author: paweljarosz

material/billboarding/assets/foliage/Rock2_stylized.png

@@ -0,0 +1,36 @@
+animations {
+  id: "tree1"
+  images {
+    image: "/assets/foliage/Tree_stylized.png"
+  }
+  playback: PLAYBACK_NONE
+}
+animations {
+  id: "tree2"
+  images {
+    image: "/assets/foliage/Tree2_stylized.png"
+  }
+  playback: PLAYBACK_NONE
+}
+animations {
+  id: "tree3"
+  images {
+    image: "/assets/foliage/Tree3_stylized.png"
+  }
+  playback: PLAYBACK_NONE
+}
+animations {
+  id: "rock1"
+  images {
+    image: "/assets/foliage/Rock_stylized.png"
+  }
+  playback: PLAYBACK_NONE
+}
+animations {
+  id: "rock2"
+  images {
+    image: "/assets/foliage/Rock2_stylized.png"
+  }
+  playback: PLAYBACK_NONE
+}
+extrude_borders: 2

material/billboarding/assets/foliage/Rock_stylized.png

@@ -0,0 +1,20 @@
+embedded_components {
+  id: "sprite"
+  type: "sprite"
+  data: "default_animation: \"rock1\"\n"
+  "material: \"/main/material/billboard.material\"\n"
+  "attributes {\n"
+  "  name: \"billboard_mode\"\n"
+  "  double_values {\n"
+  "    v: 1.0\n"
+  "  }\n"
+  "}\n"
+  "textures {\n"
+  "  sampler: \"texture_sampler\"\n"
+  "  texture: \"/assets/foliage/foliage.atlas\"\n"
+  "}\n"
+  ""
+  position {
+    y: 85.0
+  }
+}

material/billboarding/assets/foliage/Tree2_stylized.png

@@ -0,0 +1,20 @@
+embedded_components {
+  id: "sprite"
+  type: "sprite"
+  data: "default_animation: \"rock2\"\n"
+  "material: \"/main/material/billboard.material\"\n"
+  "attributes {\n"
+  "  name: \"billboard_mode\"\n"
+  "  double_values {\n"
+  "    v: 1.0\n"
+  "  }\n"
+  "}\n"
+  "textures {\n"
+  "  sampler: \"texture_sampler\"\n"
+  "  texture: \"/assets/foliage/foliage.atlas\"\n"
+  "}\n"
+  ""
+  position {
+    y: 73.0
+  }
+}

material/billboarding/assets/foliage/Tree3_stylized.png

@@ -0,0 +1,20 @@
+embedded_components {
+  id: "sprite"
+  type: "sprite"
+  data: "default_animation: \"tree1\"\n"
+  "material: \"/main/material/billboard.material\"\n"
+  "attributes {\n"
+  "  name: \"billboard_mode\"\n"
+  "  double_values {\n"
+  "    v: 1.0\n"
+  "  }\n"
+  "}\n"
+  "textures {\n"
+  "  sampler: \"texture_sampler\"\n"
+  "  texture: \"/assets/foliage/foliage.atlas\"\n"
+  "}\n"
+  ""
+  position {
+    y: 227.0
+  }
+}

material/billboarding/assets/foliage/Tree_stylized.png

@@ -0,0 +1,20 @@
+embedded_components {
+  id: "sprite"
+  type: "sprite"
+  data: "default_animation: \"tree2\"\n"
+  "material: \"/main/material/billboard.material\"\n"
+  "attributes {\n"
+  "  name: \"billboard_mode\"\n"
+  "  double_values {\n"
+  "    v: 1.0\n"
+  "  }\n"
+  "}\n"
+  "textures {\n"
+  "  sampler: \"texture_sampler\"\n"
+  "  texture: \"/assets/foliage/foliage.atlas\"\n"
+  "}\n"
+  ""
+  position {
+    y: 227.0
+  }
+}