# bug in applymatrix in 3Dpoint on z=0 plane

mathmagic shared this problem 1 year ago
Not a Problem

the red and green squares are defined similarity but applymatrix works wrong over points in XYPlane

I think GG do applymatrix over a 2D point (x,y) for points defined as (x,y,z) when z=0

Files: foro.ggb 1

It works if you redefine the 2D points as 3D

```A = (0, 0, 0)
B = (1, 0, 0)
C = (1, 1, 0)
D = (0, 1, 0)``` 1

Open with version 5 and see the points, they are well defined but applymatrix fails in B and D, defined as Point(xAxis) by clicking on Axis in 3D view.

suposse I want applymatrix over a Point(xAxis) in 3D. is it possible? how I define the point?

cases: select 3D window, select point tool,click on yaxis, you get A=Point(yAxis) with three coords--> applymatrix fails

select 3D window, type in input bar point(yAxis)--->you get a 2D point

workaround: create a point in yaxis named B then type (x(B),y(B),0) and applymatrix works in this last point like you want

Files: foro.ggb