Terrain collision - GameCreators Forum

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GreenDixy

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Posted: 16th Mar 2010 17:06 Edited at: 16th Mar 2010 17:09

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Started with gdk a bit ago now and i am trying to set it up so the player can walk and follow the ground here is the error

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1>------ Build started: Project: Dark GDK - 3D Game1, Configuration: Debug Win32 ------
1>Compiling...
1>Main.cpp
1>c:\documents and settings\greendixy\my documents\visual studio 2008\projects\dark gdk - 3d game1\dark gdk - 3d game1\level.h(33) : error C3861: 'SC_SetupObjectComplex': identifier not found
1>Build log was saved at "file://c:\Documents and Settings\GreenDixy\My Documents\Visual Studio 2008\Projects\Dark GDK - 3D Game1\Dark GDK - 3D Game1\Debug\BuildLog.htm"
1>Dark GDK - 3D Game1 - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Here is the terrain simple basic terrain

+ Code Snippet

	dbSetupTerrain        ( );										// set up terrain library
	dbMakeObjectTerrain   ( 1 );									// make a new terrain
	dbSetTerrainHeightMap ( 1, "Media/terrain/map.bmp" );					// set the terrain height map
	dbSetTerrainScale     ( 1, 30, 0.9f, 30 );						// set the scale
	dbSetTerrainSplit     ( 1, 16 );								// set the split value
	dbSetTerrainTiling    ( 1, 4 );									// set the detail tiling
	dbSetTerrainLight     ( 1, 1.0f, -0.25f, 0.0f, 1, 1, 0.78f, 0.5f );	// set the light
	dbSetTerrainTexture   ( 1, 1, 2 );								// set the textures
	dbBuildTerrain        ( 1 );									// build the terrain
    dbPositionObject( 1, 350, -40, 509);
    SC_SetupObjectComplex ( 1, 2, 2 );

Here is the player setup i appreciate any help possible on allowing the char to walk on the terrain.

+ Code Snippet

   int obj = 50;
   dbLoadObject ( "Media/People/scifi/AI.x", obj );
   dbScaleObject ( obj, 100, 100, 100 );
   dbPositionObject( obj, 350, 0, 509);
   dbYRotateObject( obj,180 );
   dbObjectAngleY(obj);
   dbFixObjectPivot( obj );
   dbTextureObject ( obj, 87 );
   SC_SetupObject( obj, 0, 1 );

Edit: Forgot to add i do have #include "SC_Collision.h" in the files

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Mireben

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Posted: 16th Mar 2010 22:02

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The SC_SetupObjectComplex is a typing mistake, the correct function name is SC_SetupComplexObject.

However, if you want to set up a terrain, then the best function to use is probably SC_SetupTerrainObject. (Unfortunately the help file mentions this function as SC_SetupTerrainCollision, but in the header it has a different name.)

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GreenDixy

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Posted: 17th Mar 2010 02:30

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so i tried "SC_SetupTerrainObject" says to use the complex command but when i use that i can still walk through the terrain with my char

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Mireben

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Posted: 17th Mar 2010 08:55

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It's not enough to just set it up, you also need to check collision somehow (e.g. with raycasting down from the position of the character) and then, if there is a collision, reset the coordinates of your character to move it back to a collision-free position. I haven't yet used Sparky's with terrain, so the most I can advise you is to study the Sparky's examples and the help file and try to figure it out.

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Mireben

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Posted: 17th Mar 2010 19:18

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Another suggestion, this occurred to me after the previous post: You don't necessarily need collision just to walk around on the terrain. There is a function dbGetTerrainGroundHeight, which tells you the height of the terrain at a given position. You can then adjust the vertical coordinate of your character with the height value. Have a look at the terrain demo which comes with Dark GDK, it is doing the same and it's simple.

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GreenDixy

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Posted: 17th Mar 2010 19:42

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thanks Mireben i will check it out and post back you have been a great help

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GreenDixy

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Posted: 17th Mar 2010 20:04

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	float fHeight = dbGetTerrainGroundHeight ( 1, dbCameraPositionX ( ), dbCameraPositionZ ( ) );

	dbPositionCamera ( dbCameraPositionX ( ), fHeight + 3.0f, dbCameraPositionZ ( ) );

This is the section you where talking about correct?

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Mireben

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Posted: 17th Mar 2010 20:08 Edited at: 17th Mar 2010 20:09

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Yes, that's it. I hope it will be useful in your program.
(If you have third person view, just substitute character position instead of camera position.)

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GreenDixy

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Posted: 17th Mar 2010 20:46

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currently i am using a third person view but thinking of switching it to normal view dunno thoe i think for not it would be a little more easier to do normal view

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Matty H

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Posted: 18th Mar 2010 01:11

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I hope you don't mind me plugging my physics/collision plug-in but here goes.

What you are doing is correct but you may eventually want the character to not go up steep slopes or to fall off cliffs, the method you are using wont allow for that.

There are a couple of collision/physics plug-ins currently being developed, my one(link in my sig) and QuickODE by Pauli, these will give you those features, whats better though is that when you add stuff to your terrain(buildings, trees etc) these plug-ins will give you sliding collision automatically.

Anyway, I would keep doing it the way you are right now but maybe keep these in mind for the future.

But if you do try my one, you should would wait for the update at the weekend.

fulcrum physics - free collision/physics plug-in for DarkGDK

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GreenDixy

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Posted: 18th Mar 2010 02:13

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@matty halewood

Thanks i will have a look into it i am still learning so right now its just basic stuff. I have my model walking with animations so far the terrain is in place etc, Just a few things i need to setup before i can move forward.

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Cetobasilius

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Posted: 18th Mar 2010 22:36

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you can do that with sparkys collision too. only its not automatic as matty said... you need to get the collision normals and then calculate the slide point.. etc etc... you can see how it functions in the slide sample...

hi

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Dark GDK / Terrain collision