LOD , effected by camera FOV

[dongju.jeong]

How do I get the LOD of the terrain to be affected by the value of the camera's FOV?

Currently, the FOV seems to vary depending on  just the distance of the camera.

[silent]

dongju.jeong

What is the typical zoom level you want to achieve? ObjectTerrainGlobal has some limitations on multiple cameras and zoom levels.

These limitations were eliminated with new Landscape Terrain object: https://developer.unigine.com/en/docs/2.10/objects/objects/terrain/landscape_terrain/

Which one you are using in your project? Do you consider upgrade to the latest Landscape Terrain for this project?

Thanks!

[dongju.jeong]

I need x8~ x10 zoom level.

Currently I have version 2.9.

I am using a georeferenced terrain made from actual local data(ecw files).
(To use Cigi,Ig api)

 

 

Does your mean that the problem has been updated in 2.10?

in 2.10,
If I use my data to make an ObjectLandscapeTerrain instead of ObjectTerrainGlobal , does it solve the problem?

 

 

 

[cash-metall]

Quote

I need x8~ x10 zoom level.

Hello! this is not a very large zoom. have you tried changed render_distance_scale? maybe this will be enough. 
 

if this is not enough you can try one trick: translate player modelview forward, but projection backward

zoom_camera->setModelview(inverse(inverse(main_mode_view) * translate(Vec3(0,0, -distance)))); // translate modelview forvard
zoom_camera->setProjection(perspective(main_fov/zoom_factor, 1.0f, distance + 0.1, z_far) * translate(vec3(0, 0, -distance))); // translate projection matrix backward

 

[dongju.jeong]

This trick affects up to the haze.

 

render->setDistanceScale()  I am not sure what is changing

[cash-metall]

render->setDistanceScale(zoom_factor) // or zoom_factor * 3 - check another param, what better. 

hmm.. may be you can show some video/screenshot with haze affects?

[dongju.jeong]

this is just Fov  set 6 [ for x10 -> 60 / 10]

 

 

this is Fov set 60 and

camera->setModelview(Math::inverse(Math::inverse(camera->getModelview()) * Math::translate(Vec3(0, 0, -5000))));    // I'm not sure I                                                                                                                                                                                                            should set the distance 5000.

camera->setProjection(perspective(60 / 10, 1.f,  0.01, 20000) * translate(vec3(0, 0, -5000)));

 

The distant landscape is also a little different. Mountain not  rendered a little.

Edited March 6, 2020 by dongju.jeong

[silent]

Regarding the terrain culling artifacts, I guess you need to tune  culling parameters, such as:

• Frustum Culling Padding
• Subpixel Polygons Reduction
• Back Face Culling
• Oblique Frustum Culling

in the terrain_global_base material: https://developer.unigine.com/en/docs/2.9/content/materials/library/terrain_global_base/#parameters

You need to experiment a little to find the best ones for your current terrain.