Creating a terrain from code?

Sanctus · March 15, 2010

Hey guys.

Before anything I'm using LE 2.22 so this may be a issue (after that I started to have strange bugs).

Anyway. How can I create a terrain just from code?

I tried this

"terrain = CreateTerrain(512,2);

UpdateTerrainNormals(terrain);"

but it doesn't seem to work at all. I see nothing.

I tried loading a heightmap but again I see nothing.

I tested the lights and other things with a cube which shows pretty well.

I just want to have a terrain to which I can set my elevations manually. I'm trying to make a scene editor (since I don't fancy the original one all that much).

VicToMeyeZR · March 16, 2010

CreateTerrain

* C: TTerrain CreateTerrain( int resolution=2048 )

* C++:

o Terrain::Terrain( TEntity ent )

o Terrain::Terrain( int resolution = 2048 )

o virtual void Create( int resolution = 2048 )

* BlitzMax: CreateTerrain:TTerrain( resolution:Int=2048 )

* Pascal: function CreateTerrain ( resolution:Integer=2048 ): THandle;

Creates a new terrain. A power-of-two size must be used for the resolution or the command will fail and return Null. To further scale the terrain, use the ScaleEntity command.

and

UpdateTerrainNormals

* C: void UpdateTerrainNormals( TEntity terrain, int x=-1, int y=-1, int width=1, int height=1 )

* C++: void Terrain::UpdateNormals( int x=-1, int y=-1, int width=1, int height=1 )

* BlitzMax: UpdateTerrainNormals( terrain:TTerrain,x:Int=-1,y:Int=-1,width:Int=1,height:Int=1 )

* Pascal: procedure UpdateTerrainNormals ( terrain:THandle,x,y,width,height );

Updates all terrain point normals.

Your not calling them correctly

Sanctus · March 16, 2010

No.. actually because I am using LE 2.22 I had to call BuildTerrain(terrain) as well. I figured it out when I looked at the change log on the old forum but I didn't know how to delete this topic.

Anyway maybe some future user might need this info

Thanks for answering tho.

VicToMeyeZR · March 16, 2010

ahh, ok. I missed that part. Sorry.

Sanctus · March 17, 2010

I updated to 2.3 and now I don't have that command anymore

However now when I try to load a terrain I get a very weird visual bug:

It's as if the image is not clearing anymore when I move the camera around.

I tried to find a command to clear the screen but I don't think there is one.

My one code was

terrain = CreateTerrain(1024);

I have a cube there.. a directional light and a point light. Intresting is the fact that the point light draws over and over on the terrain untill it becomes totally white. I faced this problem when I wasn't clearing the screen but this only happens on the terrain.

Is it just me or is this a bug?

Joh · March 17, 2010

Could you post the code?

Do you have multiple worlds? Did you use framewerk (framework on 2.3) or skyboxes?

Sanctus · March 17, 2010

Well since the project is a bit more large I can't really post the code plus that I'm not sure I'm allowed (I have to do this for someone).

No framewerk. I really don't like that thing. No sandbox (this is supposed to be a type of sandbox it'self). Just one world without any skyboxes.

Here are some chunks of code

float omx;
float omy;
SetUp();
CreateInterface();
TVec3 camRot = EntityRotation(viewCam);
TMesh cube = CreateCube();

terrain = CreateTerrain(1024);

The way I draw the scene in the while loop:

UpdateWorld();
SetBuffer(buffer);
RenderWorld();
SetBuffer(BackBuffer());
RenderLights(buffer);
UpdateInterface();
Flip(0);

Also here is the log(nothing wrong with it as far as I can see):

Leadwerks Engine 2.3
Initializing Renderer...

OpenGL Version: 2.1.2

GLSL Version: 1.20 NVIDIA via Cg compiler

Render device: GeForce 8600M GT/PCI/SSE2

Vendor: NVIDIA Corporation

DrawBuffers2 supported: 1

32 texture units supported.

GPU instancing supported: 0

Shader model 4.0 supported: 1

Conditional render supported: 0

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//query.vert", ""...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//editor/generic.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//editor/sobel.frag"...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//mesh/mesh_shadow.vert", ""...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//mesh/mesh.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//mesh/mesh.frag"...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//terrain/terrain.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//terrain/terrain.frag"...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//postfilters/postfilter.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//postfilters/depthblit.frag"...

Loading texture "incbin::noise.dds"...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//postfilters/postfilter.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//lighting/directionallight.frag"...

Loading shader "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//lighting/lightvolume.vert", "zip::c:/documents and settings/admin/desktop/sceneeditor/debug/shaders.pak//lighting/pointlight.frag"...

Loading texture "incbin::Arial9.dds"...

Joh · March 17, 2010

Well can't help you so much without seeing the code..

Anyway the best way to track a bug is start to comment part of the code till you found what cause the problem.

Sanctus · March 17, 2010

I edited the code while you were writing...

Huh... solved.

Playing with SetBlend is a bad ideed (I do this in my interface)

Using a SetBlend(BLEND_NONE) before drawing the scene seems to fix it.

Joh · March 17, 2010

Did you use Blend correctly?

Mmm didn't seen the edit..

Sanctus · March 17, 2010

Well I just used SetBlend(BLEND_ALPHA) somewhere to be able to have transparent interface.

Anyway I'm quite sure this is a little bug. Stragely it only happens to terrain. If I comment the terrain creation I see everything fine even without the SetBlend(BLEND_NONE) command.

If it is indeed a bug maybe it can be fixed in LE 2.32

VeTaL · March 17, 2010

Sanctus, also try to update your videocard drivers

I have the same one:

Leadwerks Engine 2.31

Initializing Renderer...

OpenGL Version: 3.2.0

GLSL Version: 1.50 NVIDIA via Cg compiler

Render device: GeForce 8600M GT/PCI/SSE2

Vendor: NVIDIA Corporation

DrawBuffers2 supported: 1

32 texture units supported.

GPU instancing supported: 1

Max batch size: 1024

Shader model 4.0 supported: 1

Conditional render supported: 0

Loading shader "zip::/leadwerks engine sdk/vetal/client/shaders.pak//query.vert", ""...

And i got large increase of FPS after updating drivers.

Sanctus · March 17, 2010

Hm.. I'm running this on a laptop so I'm not sure if you have the same card.(Altough I know M stands for mobile-> laptops)

Anyway last time I checked the drivers from the Dell were really old or something. Is there any place to download them?

carlb · March 17, 2010

for nvidia try http://www.laptopvideo2go.com/

can not remember the link i've give before for ati but not long and ati cat drivers will support laptops as well

VeTaL · March 18, 2010

Yep, i also work on laptop. Just wanted to say that drivers update can increase FPS and adding instancing (i saw this from your log).

Sanctus · March 18, 2010

Well sadly I installed the new drivers twice and it went bad. I mean my maximum resolution was 640x480 with 16 colors. Nice eh?

Downloaded drivers from laptopvideo2go.com (or something like that) and from nvidia oficial page.

Now I installed back the old driver which seams to work.

Also note that my windows instalation(XP) is basically a wreck. I'm still hanging on it untill it will crash and I'll have to install windows 7 or something.

Anyway from my experience with OpenGL the setblend command is clearly not a driver issue.

Btw.. thanks guys for your answers. You've been helpfull

I still have a problem with terrain raycast but I'll try to see it more indeep before thinking it's a bug.

Sanctus · March 20, 2010

New problem.

This time I'm really clueless.

I created a terrain. I use this to modify it

for(int i=p.Z-radius;i<p.Z+radius;i++)
{
for(int j=p.X-radius;j<p.X+radius;j++)
{
	float oh = TerrainHeight(terrain,i+512,j+512);
	float d = (radius-dist(p.Z,p.X,i,j))/5000.0f*strength;
	if (d>=0)
	{
		if(currentTool==TOOL_RISE)
		{
			SetTerrainHeight(terrain,i+512,j+512,oh+d);
		}
		if(currentTool==TOOL_LOWER)
		{
			SetTerrainHeight(terrain,i+512,j+512,oh-d);
		}
	}

}
}
UpdateTerrainNormals(terrain);

I saved it's heightmap using SaveTerrainHeightmap and the in the same way I loaded it back into a new terrain.

If I try to modify a loaded terrain it aparently modifies it as if it had no heightmap data.

Studied the problem more and TerrainHeight does not return the height from the new heightmap that I loaded.

Can anyone help me here?

EDIT:

Even more.. Aparently when you save a heiightmap and load it back. It get's rotated and flipped.

I attached before and after images.

Sign In

Creating a terrain from code?

Recommended Posts

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Join the conversation