Creates an isotropic material attribute
| attrName | string | name of attribute |
| Young | VariationAttr or double | Young's modulus |
| Poisson | VariationAttr or double | Poisson's ratio |
| Density | VariationAttr or double | density |
| alpha | optional VariationAttr or double | coefficeint of thermal expansion |
| massDamping | optional VariationAttr or double | Mass Rayleigh damping constant |
| stiffDamping | optional VariationAttr or double | Stiffness Rayleigh damping constant |
| temp | optional double | temperature |
| Return value | IFMaterialIsotropic |
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