如何水平翻转 Three.js 纹理

Question

I'm making a 360 viewer, so textures are inside a cylinder. Problem is that they appear inverted horizontally.

I know about texture.flipY but I haven't found a texture.flipX on the source .

So how can I flip a texture horizontally, or along the x axis, directly in the code? (not using an image editor)

Answer 1

To flip a texture horizontally, you can do the following:

texture.wrapS = THREE.RepeatWrapping;
texture.repeat.x = - 1;

As mentioned in the comments, this approach requires the texture to be a power-of-two in size.

three.js r.87

Answer 2

The answer was easier than I thought.

cylinder.scale.x = -1;

And don't forget to add

material.side = THREE.DoubleSide;

Answer 3

It might seem a bit of an overkill, but I think a nice way to do it is to turn it by 180 degrees (PI radians) around it's center then flip it:

texture.center = new THREE.Vector2(0.5, 0.5);
texture.rotation = Math.PI;
texture.flipY = false;

Answer 4

Another approach here is to change the geometry. In the cylinder geometry you specify thetaStart and thetaLength for the cylinder section you want to render, and usually you choose a positive angle, ie thetaLength>0 . If instead you pass thetaStart + thetaLength and -thetaLength to CylinderBufferGeometry , the cylinder is rendered clockwise instead of counter-clockwise, and all face normals now point inwards. So, there is no need to flip the texture anymore.