Raycast get_collision_normal() sometimes returns zero vector

icqqq

Dear all,

I am using a raycast 3d to detect if I am going to a wall. I want to get the collision normal so that I use getcollisionnormal() function. However, the function sometimes will give me zero Vector, which is (0, 0, 0)

I call the function in fixedprocess() and it seems it return the right normal vector and zero vector interchangeably like the following: (0, 0, 0) (-0.5, 0, -0.866025) (0, 0, 0) (-0.5, 0, -0.866025) (0, 0, 0) (-0.5, 0, -0.866025)

but sometimes it do give me the normal vector continuously like the following: (-0.5, 0, -0.866025) (-0.5, 0, -0.866025) (-0.5, 0, -0.866025) (-0.5, 0, -0.866025) (-0.5, 0, -0.866025)

How can I solve the zero vector problem?

Thank you.

MagicLord

Do you use a raycast node ? Is the collider object right ? Post a download to a small example so we can debug.

icqqq

https://drive.google.com/file/d/1KIz0cKJaxt31ykM2oz0mnKBUIvfCbLrH/view?usp=sharing

Please check the attachment I use raycast node, and I am using Godot 2.1.4 Thank you so much

rjoshua

Hey guy, I found your problem, it's easy to resolve. The problem is in the distance of the ray to the body, the distance is very far, thus, when you are far to the wall and jump the normal is good, but when you get closer again throw zero vector.

This is because the rayCat is Inside of the wall and hit with faces inside of the polygon, this faces are invalidad "don't have normal", their normal is (0, 0, 0).

Check this yoursefl, bring near the raycast to the body and then bring far to it!

I'll hope my english explain can be clear! :)

icqqq

Thank you so much! It works!!!