stride3d/stride

Character component with complex collider throws exception and crashes program

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#1,177 opened on Nov 4, 2021

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 (2 comments) (0 reactions) (0 assignees)C# (6,001 stars) (886 forks)batch import
area-Physicsbuggood first issue

Description

  1. Starting with the Stride "Terrain" sample.
  2. Added a vehicle model fbx file.
  3. Used Add Physics asset / convex hull to create collider
  4. Used this collider with a rigid body, works fine.
  5. Tried to use this collider with a character component, and it crashes the program.
  6. Made a much simpler multi box collider for the vehicle (one rectangle and four cylinders).
  7. This simpler collider also crashes the program when used with a character component.

Stack trace from crash attached

strideCharacterWithComplexColliderCrash.txt

Contributor guide

Tech stack
csharp
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C# programmingStride game engine basicsPhysics collider concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Examine the stack trace attached to the issue (strideCharacterWithComplexColliderCrash.txt) to identify the exact crash location. Look at the CharacterComponent class and its interaction with collider types, specifically how complex colliders (convex hulls, compound colliders) are handled. Reproduce the crash using the described steps and check if any assumptions about collider shape are violated. Consider reviewing recent changes to the physics system that might have introduced the bug.
Character component with complex collider throws exception and crashes program · stride3d/stride#1177 | Good First Issue