bugfix - initializing Material::Param to valid value (else get random cores on 'free' when it thinks it had a string)
bugfix - initializing Material::Param to valid value (else get random cores on 'free' when it thinks it had a string)

wilsonCernWq/ospray,ospray/OSPRay,MengjiaoH/ospray,ospray/OSPRay,Twinklebear/OSPRay,wilsonCernWq/ospray,favreau/OSPRay,MengjiaoH/ospray,MengjiaoH/ospray,ospray/OSPRay,Twinklebear/OSPRay,favreau/OSPRay,MengjiaoH/ospray,wilsonCernWq/ospray,ospray/OSPRay,Twinklebear/OSPRay,favreau/OSPRay,favreau/OSPRay,MengjiaoH/ospray,Twinklebear/OSPRay