Fix two broken models causing black glitches.

- They had vertexes groups without weights.
- Both of them were unused one incorrectly so.
- Also fix the material while at it.
Refs #6714

This was SVN commit r27515.

binaries/data/mods/public/art/actors/props/structures/celts/merchant_sail_folded.xml

@@ -1,38 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<actor version="1">
-  <castshadow/>
-  <group>
-    <variant frequency="100" name="sail mesh">
-      <mesh>props/celt_merchant_sail_folded.dae</mesh>
-      <animations>
-        <animation file="others/celt_merchant_sail_folded_idle.dae" name="idle" speed="100"/>
-      </animations>
-    </variant>
-  </group>
-  <group>
-    <variant frequency="1" name="swirl">
-      <textures>
-        <texture file="props/celt_sail_swirl.dds" name="baseTex"/>
-      </textures>
-    </variant>
-    <variant frequency="1" name="circle">
-      <textures>
-        <texture file="props/celt_sail_circle.dds" name="baseTex"/>
-      </textures>
-    </variant>
-    <variant frequency="1" name="face">
-      <textures>
-        <texture file="props/celt_sail_face.dds" name="baseTex"/>
-      </textures>
-    </variant>
-  </group>
-  <group>
-    <variant>
-      <textures>
-        <texture file="default_norm.png" name="normTex"/>
-        <texture file="null_black.dds" name="specTex"/>
-      </textures>
-    </variant>
-  </group>
-  <material>player_trans_norm_spec.xml</material>
-</actor>

binaries/data/mods/public/art/actors/props/structures/romans/trireme_fore_sail.xml

@@ -1,16 +1,16 @@
-<?xml version="1.0" encoding="utf-8"?>
-<actor version="1">
-  <castshadow/>
-  <float/>
-  <group>
-    <variant file="others/ships/rome_fore_sail_base.xml" name="Trireme Sail">
-      <mesh>props/rome_trireme_fore_sail.dae</mesh>
-      <textures>
-        <texture file="props/sail_blank_netting_new.png" name="baseTex"/>
-        <texture file="props/ptol_sail_norm.png" name="normTex"/>
-        <texture file="props/sail_spec_1.png" name="specTex"/>
-      </textures>
-    </variant>
-  </group>
-  <material>player_trans_parallax_spec.xml</material>
-</actor>
+<?xml version="1.0" encoding="utf-8"?>
+<actor version="1">
+  <castshadow/>
+  <float/>
+  <group>
+    <variant file="others/ships/rome_fore_sail_base.xml" name="Trireme Sail">
+      <mesh>props/rome_trireme_fore_sail.dae</mesh>
+      <textures>
+        <texture file="props/sail_blank_netting_new.png" name="baseTex"/>
+        <texture file="props/ptol_sail_norm.png" name="normTex"/>
+        <texture file="props/sail_spec_1.png" name="specTex"/>
+      </textures>
+    </variant>
+  </group>
+  <material>player_trans_norm_spec.xml</material>
+</actor>

binaries/data/mods/public/art/actors/structures/romans/trireme.xml

@@ -6,7 +6,7 @@
     <variant frequency="1" file="others/ships/rome_trireme_oars.xml" name="Rome Trireme">
       <mesh>structural/rome_ship_trireme.dae</mesh>
       <props>
-        <prop actor="props/structures/romans/bireme_fore_sail.xml" attachpoint="fore_sail"/>
+        <prop actor="props/structures/romans/trireme_fore_sail.xml" attachpoint="fore_sail"/>
         <prop actor="props/structures/romans/trireme_main_sail.xml" attachpoint="main_sail"/>
         <prop actor="props/structures/romans/rome_bridge_base.xml" attachpoint="bridge"/>
         <prop actor="props/units/siege_artillery/bolt_projectile_med.xml" attachpoint="projectile"/>
@@ -24,5 +24,5 @@
     <variant frequency="1" file="others/ships/rome_trireme_shields_02.xml" name="Roman Trireme Shields-02"/>
     <variant frequency="1" file="others/ships/rome_trireme_shields_03.xml" name="Roman Trireme Shields-02"/>
   </group>
-  <material>player_trans_ao_parallax_spec.xml</material>
+  <material>player_trans_ao_norm_spec.xml</material>
 </actor>