[solved] How can I find and select characters that are in camview?

yn97 · April 28, 2019, 4:51pm

1-how can I find and select characters that are in cam view? (double click and select all in camView)
2-and a selection like multi-select in C&C game? (click and drag and draw a square and select what are in the square area).

jayfella · April 28, 2019, 5:15pm

If an object isn’t in view it will be culled, so you can start from there.

Objects should be grouped in one way or another (tanks, footmen, workers, etc) so just iterate the group and check the cull hint.

Without knowing your setup, that’s the quickest way.

A better way would be a radial area check. If you know how to draw a circle then you know how to check if a coordinate is in the circle.

The second way avoids using the scene - which is the way i would be more inclined to use.

jayfella · April 28, 2019, 5:33pm

For your second point see here.

Point A is the point where the mouse is pressed, point B is where the mouse is released. You will have both the 2D and 3D coords to draw a rectangle on both scenes.

https://gist.github.com/jayfella/2683d763b8aa19b4206048bc4d67f51a

sgold · May 7, 2019, 4:03am

Has your question been adequately answered? If so, please let us know!

yn97 · May 13, 2019, 8:44pm

no, it is not working…
if a node gets out of the camera view and was not on screen its CullHint doesn’t change.

if (node.getCullHint() == Spatial.CullHint.Always) {
            System.out.println("it`s not in camview");
        }

jayfella · May 13, 2019, 9:17pm

The method I linked to tells you everything on how a spatial is determined whether or not to be culled.

github.com

jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/main/java/com/jme3/scene/Spatial.java#L356


    }
}
/**
 * <code>checkCulling</code> checks the spatial with the camera to see if it
 * should be culled.
 * <p>
 * This method is called by the renderer. Usually it should not be called
 * directly.
 *
 * @param cam The camera to check against.
 * @return true if inside or intersecting camera frustum
 * (should be rendered), false if outside.
 */
public boolean checkCulling(Camera cam) {
    if (refreshFlags != 0) {
        throw new IllegalStateException("Scene graph is not properly updated for rendering.\n"
                + "State was changed after rootNode.updateGeometricState() call. \n"
                + "Make sure you do not modify the scene from another thread!\n"
                + "Problem spatial name: " + getName());
    }

pspeed · May 13, 2019, 9:22pm

That’s because cull hint is not a status. It’s a HINT to how culling should be done on this spatial.

https://javadoc.jmonkeyengine.org/com/jme3/scene/Spatial.CullHint.html

It helps to be careful of what the input to a process is versus the output to a process. Sometimes the javadoc can be helpful in that regard. (Sometimes not.)

yn97 · May 13, 2019, 9:22pm

thank you so much.