Street in Terrain :-(
Blitz3D Forums/Blitz3D Programming/Street in Terrain :-(
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| Hello , i have my own Terrain as some quadmeshes , each quadmesh has many smaller quads and each has 2 triangles . this terrain is build by many waypoints from my gps receiver . with this waypoints i will make a street and this is interpolated with bezier over 2 or 4 points in curves . Now the problem is that the street goes under the terrain and there are overlapped triangles because the terrain has only a few points and the road cross the terrain . i think that i must split the terrain in more triangles where a vertex is near from street mesh but i don't know how i can do it . The road is more than 20 Miles and each 2 or 4 waypoints i used a new mesh . Has someone any idears for me ? PLEASE :-)    |
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| Have you tried to draw the street after the terrain by setting the appropriate EntityOrder? |
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| No, but i will try it :-) In the Moment i try a intersection test triangle street in triangle terrain and move the terrain down , but if the street under the terrain sometimes i have no intersection . EDIT: EntityOrder dosn't work :-( because the terrain is build with many quadmeshes and then it have all the same Z Order but this is wrong . |
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| Hmm ... isn't the terrain one entity and the street another? then it should work. If not I would handle them seperately. |
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| Why not just push the street up a few notches? Otherwise playing with CameraRange might help! Fredborg |
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| You application makes me curious... there has got to be hundreds of waypoints on that grid (I am assuming the dots are waypoints?)... did you really go by hand and plot each and every point? And what is your application for? |
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| yeah I was thinking the same thing. That would be nuts if he walked that whole grid, and I don't see how the GPS could possibly be that accurate either! :-) I mean is a GPS really accurate to a few meters in altitutde? |
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| Sswift, yes... the GPS i have on my boat is accurate to a meter. Tracer |
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| For altitude? You got a flying boat??? |
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| LOL.. well, as a matter of speaking.. yes .. i can use my GPS to determine the depth of the water below the boat.. in some cases you don't want to scare a particular species of fish away by using the depth sounder, in that case, my GPS can give me the depth at a certain location, at an accuracy of one meter. Also, on a more "normal" topic then, the jets my boss builds, determine altitudes just fine, with the latest and greatest GPS system, up to 25 to 50 cm accurate. And that goes for every direction. Basically, the more GPS sats you can contact in one go, the more accurate you get. I believe the maximum for a high altitude airplane is 12. I think my boat's GPS uses 8. My car uses 3 or 4. Tracer |
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| @Dirk Krause The Terrain are 720 Meshes and the Road are 1000 Meshes . @Fredborg If i move the Street up it must be min. one meter+ and i must use walls around the Road and i will drive on terrain and the street without hills. The CameraRange take not effect . For the Terrain and Street Meshes i have a Auto Show/Hide Function to speed up the program . @RexRhino the waypoints are from the activelog from gps receiver and can exported as ascii file and this i read into my prog. @sswift yes my GPS is accurate to 3 meters and it have a sensor for the altitude to find the right height . the waypoints i have sampled by driving around with my car and some differences are no problem . @all next i will try to make the terrain a little bit different |/|/| |/|/| |/|/| |/|/| to this |\|/| |/|\| |\|/| |/|\| |
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| Also, isn't there other tricks that a GPS reciever can do?? Like it can also recieved signals from certain communications satalites, and then use that to get a more accurate reading than if it was JUST using GPS. Or, if you enter in the exact known coordinates (like of a landmark or something), then it can be more accurate a certain distance away from that landmark. |
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| Markus, I am trying a similar thing, albeit with some difference... I am trying to use some commercially available database of street networks...And while travelling, will synchronize it with the data received form GPS receiver... Is there a way you can help me or vice versa? |
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