8u40 review request: RT-39120 Shape objects are blurry in some 3D transforms

[Jim Graham]

Jira: https://javafx-jira.kenai.com/browse/RT-39120
webrev: http://cr.openjdk.java.net/~flar/RT-39120/webrev.01/

This is a fallout fix from working on RT-38948...

                        ...jim