diff --git a/build/three.js b/build/three.js
index 539381bb02ef729c33284a59b220bb6b8ef62e7e..141da69b91a3c99bdd9b03a2fd7b654e21870969 100644
--- a/build/three.js
+++ b/build/three.js
@@ -21108,7 +21108,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				influence = influences[ i ];
 
-				if ( influence > 0 ) {
+				if ( influence !== 0 ) {
 
 					activeInfluenceIndices.push( [ influence, i ] );
 
diff --git a/build/three.min.js b/build/three.min.js
index b95e678556dba0869ce56a30fa1ac53941599109..e5f05c58ce8abdfb8fe741e73ce5076ea3536547 100644
--- a/build/three.min.js
+++ b/build/three.min.js
@@ -547,7 +547,7 @@ c.array.length;else for(1<n.length&&(b=!0),p=0,q=n.length;p<q;p++)s=n[p].index,b
 Uint32Array?(k=l.UNSIGNED_INT,m=4):(k=l.UNSIGNED_SHORT,m=2),n=g.offsets,0===n.length)b&&(e(d,a,g,0),l.bindBuffer(l.ELEMENT_ARRAY_BUFFER,c.buffer)),l.drawElements(h,c.array.length,k,0),J.info.render.calls++,J.info.render.vertices+=c.array.length;else for(1<n.length&&(b=!0),p=0,q=n.length;p<q;p++)s=n[p].index,b&&(e(d,a,g,s),l.bindBuffer(l.ELEMENT_ARRAY_BUFFER,c.buffer)),l.drawElements(h,n[p].count,k,n[p].start*m),J.info.render.calls++,J.info.render.vertices+=n[p].count;else b&&e(d,a,g,0),d=g.attributes.position,
 l.drawArrays(h,0,d.array.length/3),J.info.render.calls++,J.info.render.points+=d.array.length/3};this.renderBuffer=function(a,b,c,d,e,k){if(!1!==d.visible){v(k);c=x(a,b,c,d,k);b=c.attributes;a=!1;c=16777215*e.id+2*c.id+(d.wireframe?1:0);c!==Sa&&(Sa=c,a=!0);a&&f();if(!d.morphTargets&&0<=b.position)a&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglVertexBuffer),g(b.position),l.vertexAttribPointer(b.position,3,l.FLOAT,!1,0,0));else if(k.morphTargetBase){c=d.program.attributes;-1!==k.morphTargetBase&&0<=c.position?
 (l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphTargetsBuffers[k.morphTargetBase]),g(c.position),l.vertexAttribPointer(c.position,3,l.FLOAT,!1,0,0)):0<=c.position&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglVertexBuffer),g(c.position),l.vertexAttribPointer(c.position,3,l.FLOAT,!1,0,0));if(k.morphTargetForcedOrder.length)for(var m=0,n=k.morphTargetForcedOrder,q=k.morphTargetInfluences;m<d.numSupportedMorphTargets&&m<n.length;)0<=c["morphTarget"+m]&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphTargetsBuffers[n[m]]),
-g(c["morphTarget"+m]),l.vertexAttribPointer(c["morphTarget"+m],3,l.FLOAT,!1,0,0)),0<=c["morphNormal"+m]&&d.morphNormals&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphNormalsBuffers[n[m]]),g(c["morphNormal"+m]),l.vertexAttribPointer(c["morphNormal"+m],3,l.FLOAT,!1,0,0)),k.__webglMorphTargetInfluences[m]=q[n[m]],m++;else{var n=[],q=k.morphTargetInfluences,s,r=q.length;for(s=0;s<r;s++)m=q[s],0<m&&n.push([m,s]);n.length>d.numSupportedMorphTargets?(n.sort(p),n.length=d.numSupportedMorphTargets):n.length>
+g(c["morphTarget"+m]),l.vertexAttribPointer(c["morphTarget"+m],3,l.FLOAT,!1,0,0)),0<=c["morphNormal"+m]&&d.morphNormals&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphNormalsBuffers[n[m]]),g(c["morphNormal"+m]),l.vertexAttribPointer(c["morphNormal"+m],3,l.FLOAT,!1,0,0)),k.__webglMorphTargetInfluences[m]=q[n[m]],m++;else{var n=[],q=k.morphTargetInfluences,s,r=q.length;for(s=0;s<r;s++)m=q[s],0!==m&&n.push([m,s]);n.length>d.numSupportedMorphTargets?(n.sort(p),n.length=d.numSupportedMorphTargets):n.length>
 d.numSupportedMorphNormals?n.sort(p):0===n.length&&n.push([0,0]);for(m=0;m<d.numSupportedMorphTargets;)n[m]?(s=n[m][1],0<=c["morphTarget"+m]&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphTargetsBuffers[s]),g(c["morphTarget"+m]),l.vertexAttribPointer(c["morphTarget"+m],3,l.FLOAT,!1,0,0)),0<=c["morphNormal"+m]&&d.morphNormals&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglMorphNormalsBuffers[s]),g(c["morphNormal"+m]),l.vertexAttribPointer(c["morphNormal"+m],3,l.FLOAT,!1,0,0)),k.__webglMorphTargetInfluences[m]=
 q[s]):k.__webglMorphTargetInfluences[m]=0,m++}null!==d.program.uniforms.morphTargetInfluences&&l.uniform1fv(d.program.uniforms.morphTargetInfluences,k.__webglMorphTargetInfluences)}if(a){if(e.__webglCustomAttributesList)for(c=0,q=e.__webglCustomAttributesList.length;c<q;c++)n=e.__webglCustomAttributesList[c],0<=b[n.buffer.belongsToAttribute]&&(l.bindBuffer(l.ARRAY_BUFFER,n.buffer),g(b[n.buffer.belongsToAttribute]),l.vertexAttribPointer(b[n.buffer.belongsToAttribute],n.size,l.FLOAT,!1,0,0));0<=b.color&&
 (0<k.geometry.colors.length||0<k.geometry.faces.length?(l.bindBuffer(l.ARRAY_BUFFER,e.__webglColorBuffer),g(b.color),l.vertexAttribPointer(b.color,3,l.FLOAT,!1,0,0)):void 0!==d.defaultAttributeValues&&l.vertexAttrib3fv(b.color,d.defaultAttributeValues.color));0<=b.normal&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglNormalBuffer),g(b.normal),l.vertexAttribPointer(b.normal,3,l.FLOAT,!1,0,0));0<=b.tangent&&(l.bindBuffer(l.ARRAY_BUFFER,e.__webglTangentBuffer),g(b.tangent),l.vertexAttribPointer(b.tangent,4,