Get face rotation Three.js

Get face rotation Three.js

By : sunkq
Date : November 17 2020, 04:28 AM
I wish this helpful for you WebGL defines vertices and faces with coordinates, colors, and normals. A face normal is a normalized vector, perpendicular to the face plane (and generally pointing 'outside' the mesh). It defines its orientation and enables calculation of lightning for instance. In three.js you can access it via face.normal.
code :

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Direct X Rotation / C# how to get two mesh objects to always face each other

Direct X Rotation / C# how to get two mesh objects to always face each other

By : Usman Hameed
Date : March 29 2020, 07:55 AM
I hope this helps . Well thats definitely doable. You need to set up an orthonormal basis such that the 2 objects point each other. I'm going to assume that your cone is set up such that the point is down the Z-Axis (You need to bear this in mind).
Cone A is at position P
code :
S.x,  S.y,  S.z,  0
U.x,  U.y,  U.z,  0
A'.x, A'.y, A'.z, 0
P.x, P.y, P.z, 1
S.x, U.x, A'.x, P.x
S.y, U.y, A'.y, P.y
S.z, U.z, A'.z, P.z
0,   0,   0,    1
Find delta angle to use for rotation given entity with position, initial rotation and target point to 'face toward'

Find delta angle to use for rotation given entity with position, initial rotation and target point to 'face toward'

By : Rajam Govindasamy
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can use the dot product to determine the cosine of the angle (in radians) between the current orientation and the point you want to face. Assume the agent doing the viewing is locate at the origin and oriented to face some direction given by the angle θ relative to the Y-Axis (i.e. 0 degrees is "up" or "north"). You want to find the angular difference θ' between that direction and facing a point (x, y). That is given by:
code :
θ' = cos-1[(x*sin(θ) + y*cos(θ)) / sqrt(x2 + y2)]
Font face rotation in Internet Explorer 8

Font face rotation in Internet Explorer 8

By : user5177625
Date : March 29 2020, 07:55 AM
should help you out This will not be a piece of cake...
When you use filters, text anti aliasing is switched off...
code :
Box rotation parallel to selected face

Box rotation parallel to selected face

By : Moin Malik
Date : March 29 2020, 07:55 AM
wish helps you Object3D.lookAt() is a handy method that will serve your purposes.
First create your mesh's geometry so it is "looking" by default in the direction of the positive-z axis. Then call mesh.lookAt(). For example:
code :
square.lookAt( intersects[ 0 ].face.normal );
square.position.copy(intersects[ 0 ].point );
opengl rotation can't see back face

opengl rotation can't see back face

By : TechTweaks
Date : March 29 2020, 07:55 AM
wish help you to fix your issue
but when I enable GL_CULL_FACE,rotation can't see the back face,This is front and back face.
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