Change Details

The substep loop for rigid bodies causes unequal effects of force fields depedending on the substep setting, larger substep counts cause a diminishing effect of force fields. This is because the force to apply on a body is reset in Bullet after each step and needs to be recomputed. Without this the body will just coast with constant velocity after the first substep. Since the per-step impulse with larger substep counts is smaller, the effect is that more substeps cause a smaller total impulse. The fix is to move the `rigidbody_update_simulation` call into the substep loop and compute forces for each substep. Note that this may be considered a breaking change, because the breaking commit rB1aa54d4921c2 has been in master for a long time and after this fix force fields will generally have a much larger effect on rigid bodies (10x for the default setting of 10 substeps).

Fixes T98272 The substep loop for rigid bodies causes unequal effects of force fields depedending on the substep setting, larger substep counts cause a diminishing effect of force fields. This is because the force to apply on a body is reset in Bullet after each step and needs to be recomputed. Without this the body will just coast with constant velocity after the first substep. Since the per-step impulse with larger substep counts is smaller, the effect is that more substeps cause a smaller total impulse. The fix is to move the `rigidbody_update_simulation` call into the substep loop and compute forces for each substep. Note that this may be considered a breaking change, because the breaking commit rB1aa54d4921c2 has been in master for a long time and after this fix force fields will generally have a much larger effect on rigid bodies (10x for the default setting of 10 substeps).

Fixes T98272 The substep loop for rigid bodies causes unequal effects of force fields depedending on the substep setting, larger substep counts cause a diminishing effect of force fields. This is because the force to apply on a body is reset in Bullet after each step and needs to be recomputed. Without this the body will just coast with constant velocity after the first substep. Since the per-step impulse with larger substep counts is smaller, the effect is that more substeps cause a smaller total impulse. The fix is to move the `rigidbody_update_simulation` call into the substep loop and compute forces for each substep. Note that this may be considered a breaking change, because the breaking commit rB1aa54d4921c2 has been in master for a long time and after this fix force fields will generally have a much larger effect on rigid bodies (10x for the default setting of 10 substeps).