Robin Williams' death prompts kid from Jumanji to open up about HIS depression

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Robin Williams is inspiring people even in death ... his young co-star from "Jumanji" has decided it's time for people like him suffering from depression to shed the shame.

Somehow our photog spotted Bradley Pierce -- who played Peter Shepard in the classic 1995 comedy -- Wednesday night in L.A.

Pierce said he's been motivated to talk openly about his battle with depression, which he's dealt with since he was 16.

Pierce also shared a great story about Williams from the set of "Jumanji" about filming the monsoon scene -- the only time he ever got aggressive.