Fix outerProduct function in visual shaders

scene/resources/visual_shader_nodes.cpp

@@ -2106,7 +2106,7 @@ String VisualShaderNodeOuterProduct::get_output_port_name(int p_port) const {
 }
 
 String VisualShaderNodeOuterProduct::generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview) const {
-	return "\t" + p_output_vars[0] + " = outerProduct( " + p_input_vars[0] + ", " + p_input_vars[1] + " );\n";
+	return "\t" + p_output_vars[0] + " = outerProduct( vec4(" + p_input_vars[0] + ", 0.0), vec4(" + p_input_vars[1] + ", 0.0) );\n";
 }
 
 VisualShaderNodeOuterProduct::VisualShaderNodeOuterProduct() {