Getting a angle for an entity relative to a surface normal it has collided with?

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(tu) sinu

try using the values from either

tformvector collx,colly,collz,1,car,0 or

tformvector collx,colly,collz,1,0,car

iirc one of these will report values relative to the car. So hitting head on will always return 1/ positive z value etc