A PA60 PLT TAXIING INTO A BRIGHT MORNING SUN STRUCK THE WINGTIP OF A PA28 RESULTING IN INCURSION ON A TXWY.

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I CALLED FOR MY IFR CLRNC TO ZZZ1 AND TAXI INSTRUCTIONS. AFTER COPYING MY CLRNC; I STARTED TO TAXI E ON THE RAMP. GND DID NOT ADVISE ME OF AN ACFT ON THE TXWY. I WAS TAXIING AND THE SUN WAS DIRECTLY IN MY EYES. I DID NOT SEE THE ACFT SITTING ON THE TXWY AND MY R WINGTIP STRUCK THE OTHER WINGTIP AS I MADE THE TURN NBOUND. I AM NOT SURE WHY THE OTHER PLT HAD TAXIED ONTO THE TXWY AND STOPPED; WITH THE ENG RUNNING. I DON'T KNOW WHY HE WAS NOT TALKING TO GND CTL (OR IF HE WAS; WHY GND DID NOT TELL ME HE WAS SITTING THERE). ACCORDING TO A WITNESS; HE HAD BEEN SITTING THERE FOR 5-10 MINS. THE BRIGHT SUN; CLR SKIES; AND UNRESTR VISIBILITY WERE THE FACTORS IN NOT SEEING THE PLANE. IN THE FUTURE; TO AVOID THIS SIT; I WILL MAKE SURE TO TAXI IN A FASHION THAT THE SUN DOES NOT PLAY A FACTOR. IF UNABLE; I WILL DELAY THE TAXI UNTIL IT IS NO LONGER A FACTOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: I CALLED TO DETERMINE IF THIS IS CLASSIFIED AS AN ACCIDENT OR INCIDENT. THE RPTR SAID HE HAS NOT HEARD FROM THE FAA; BUT THE DAMAGE WAS MINOR AND HE'S NOT SURE IT'LL BE CLASSIFIED AS EITHER. I ASKED HIM ABOUT VISUAL OBSTRUCTIONS OTHER THAN THE SUN. HE SAID THAT WHEN HE WIPED THE ACFT OFF PRIOR TO TAXI THAT HE WAS NOT ABLE TO GET ALL OF THE MOISTURE FROM THE WINDSHIELD. THE REMAINING MOISTURE LEFT A FILM WHICH PREVENTED CLR VISION AND ALLOWED A GLARE FROM THE RISING SUN. THE ACFT HE COLLIDED WITH WAS COMING FROM A RAMP AND WAS SITTING ON A TXWY AS IT JOINED THE MAIN RTE.