How can I move a corner of a quad mesh? [solved]

yn97 · May 20, 2019, 9:12pm

I need to draw a square for a multi-select.
but I dont know how to move a corner of square and extend it according to mouse position…

yan · May 21, 2019, 1:50am

Basic idea: recalculate vertex positions and reset the mesh buffer.

github.com

jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/main/java/com/jme3/scene/shape/Quad.java#L98


}
public float getWidth() {
    return width;
}
public void updateGeometry(float width, float height){
    updateGeometry(width, height, false);
}
public void updateGeometry(float width, float height, boolean flipCoords) {
    this.width = width;
    this.height = height;
    setBuffer(Type.Position, 3, new float[]{0,      0,      0,
                                            width,  0,      0,
                                            width,  height, 0,
                                            0,      height, 0
                                            });
    
    if (flipCoords){

grizeldi · May 21, 2019, 3:42pm

You could do it in a vertex shader if it’s for visual purposes only.

Etherblood · May 21, 2019, 9:39pm

You could also just create a 1x1 quad and scale it according to width/height required.

sgold · May 22, 2019, 5:00am

Has your question been adequately answered?

yn97 · May 23, 2019, 1:44am

yes