I plot a surface in a Plot Cube with TwoDMode = true, when I try to zoom using the mouse left drag, the selection zoom rectangle goes behind the surface, therefore, it is not properly shown. Is it possible to force the selection rectangle to be on top of the surface? Moreover, is it possible by hovering or clicking the mouse on the surface, the X, Y and Z values be shown in some textboxes? Thank you very much.
Surfaces are inherently 3D objects. By default, they are intended to be used with ILPlotCube.TwoDMode set to false. But you can try to access the selection rectangle object and modify it accordingly. Try starting with plotCube.ZoomRectangle.Lines.Positions by raising its Z coordinate in order to move it closer to the camera.
Archieving the point of the surface under the cursor is not easy - but doable. Keep in mind, only the vertices of the surface tiles are known explicitly. You can use picking and the mouse events to get informed, if the mouse is over the surface:
surface.MouseMove += (_s,_a) => { yourHandler(_a); }
Afterwards, you are on your own. First, you will have to find the actual surface 3D coordinates. If you can be sure that the surface has not been rotated, you can take a look here.
The method in that thread gives you the surface X and Y coordinates. You can go further and (manually) find the corresponding tile for that position. For the final and exact X,Y,Z coordinates, you would have to interpolate the tile (triangle) vertices to the actual mouse position, using barycentric interpolation.
In order to show the 3D coordinate, you can simply use an ILLabel. You may or may not want to put that into an ILScreenObject.
Related
I have a number of object drawn in world co-ordinates with arbitrary transforms - rotation & scaling. I want to pick one of the objects via a mouse click, I have the rectangles of the objects but need to transform the mouse click co-ordinates in order to select the picked object. At the simplest I draw an object with transform (middle of bitmap) and rotate (45). How do I map the mouse click in the graphics area back to the world space of the objects?
Thanks
Richard
I have a 2D unity project.
I cannot depend on OnMouseExit because overlapping 2D box colliders cause the method to trigger even when the mouse is inside the bounds, since something else is in front (which is not my intention).
I was going to manually check for the mouse exiting on every frame by using:
if(!_collider.bounds.contains(Input.MousePosition))
But this does not work because `mouse position' is in terms of the number of pixels across the screen, and 'bounds' is in terms of "units" relative to the origin of the scene. The camera is Orthographic and slides around to look at the 2D plane that the world's sprites sit on. I have no idea how many "units" fit across the screen and suspect that it would change as soon as you change the aspect ratio or screen size.
You can use ScreenToWorldPoint(), to convert from screen point to 3D/2D point based on the camera's viewport, something like this:
if(!_collider.bounds.contains(Camera.main.ScreenToWorldPoint(Input.MousePosition)))
Hi I'm trying to get a particular coordinate on texture (under mouse cursor). So on mouse event I'm performing:
Ray outRay = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit clickRayHit = new RaycastHit();
if (!Physics.Raycast(outRay, out clickRayHit))
{
return;
}
Vector2 textureCoordinate = clickRayHit.textureCoord;
Texture2D objectTexture = gameObject.GetComponent<Renderer>().material.mainTexture as Texture2D;
int xCord = (int)(objectTexture.width * textureCoordinate.x);
int yCord = (int)(objectTexture.height * textureCoordinate.y);
But the problem is that the coordinate I'm getting is not preciesly under the cursor but "somewhat near it". And it's not like coordinates are consistently shifted in one way but shifting is not random as well. They are shifted differently in different points of the texture but:
they remain somwhere in the area of real cursor
and coordinates shifted in the same way when cursor is above the same point.
Here is part of coordinates log: http://pastebin.ca/3029357
If i haven't described problem good enough I can record a short screencast.
GameObject is a Plane.
If it is relevant mouseEvent is generated by windows mouseHook. (Application specific thing)
What am I doing wrong?
UPD: I've decided to record screencast - https://youtu.be/LC71dAr_tCM?t=42. Here you can see Paint window image through my application. On the bottom left corner you can see that Paint is displaying coordinates of the mouse (I'm getting this coordinates in a way I've described earlier - location of a point on a texture). So as I move mouse cursor you can see how coordinates are changing.
UPD2:
I just want to emphasize one more time that this shift is not constant or linear. There could be "jumps" around the mouse coordinates (but not only jumps). The video above explains it better.
So it was scaling problem after all. One of the scale values were negative and was causing this behaviour.
Hi is there any way to get the X,Y,Z of mouse in direct3d after I translate and rotate the world matrix?
The mouse doesn't have a Z coordinate because it's not a three-dimensional pointing device.
The best you can do is project the mouse's (x,y) coordinate on the screen through the viewing frustum to determine which portion of the viewing frustum correlates to the pixel position under the mouse cursor.
DirectX is completely unaware of mouse and any other input devices. It just is not what it cares about.
To get x and y coordinates you call Win32 API functions (this depends on framework you are using)
To get a z coordinate, you must implement Ray Picking. There is no uniform way, as this depends on how picked objects are implemented. Here are some tutorials on XNA Picking.
I have to draw a map with Managed DirectX. The map arrived in MapInfo format (lines, polylines, regions/polygons). Polygons are already triangulated (done with GLUtesselator).
The idea:
GPS Coordinates are converted to x,y points (Mercator Projection)
I use PositionColored VertexFormat
Center of the view is [x,y] (can modify by mouse move)
Camera is always positioned to [x,y,z] where z is the zoom (-100 by default, can modify by mouse wheel)
Camera target is: [x,y,0], camera up: [0,1,0]
The layers of the map are positioned by Z (+1.0, 0.99, 0.98, 0.97...etc)
I can already do:
Draw lines and polylines
Draw one layer of polygons
My problem is: when I want to draw all layers I see only one of them. I think there is some problem with z ordering. What should I do to solve this? Modify the RenderState? The best would be if I could draw as in GDI (first in the back, last in the front).
Other question: how can I get the coordinate of a pixel under the mouse cursor? (in the GDI version of the map I could do it because I used my own viewport for rendering, but now directx do everything)
Thanks!
If your map is purely 2D, make sure that Z buffering is turned off. Once it is, things will display in the order you draw them in.