Light, big surfaces

[Hirte]

Hello,

I have found some threads, but no one has helped me...

I have a mesh

mesh = smgr->getMesh("./data/models/street_1_1.ms3d");
node = smgr->addAnimatedMeshSceneNode(mesh);
node->setMaterialTexture(0, driver->getTexture("./data/images/street_1.jpg"));
node->getMaterial(0).EmissiveColor.set(0,0,0,0);
node->setMaterialType(video::EMT_SOLID);
node->setPosition(loc);
node->setRotation(rot);
mesh->drop();

and a dynamic light

scene::ILightSceneNode* light1 = smgr->addLightSceneNode(0,camvec,video::SColorf(1.0f, 1.0f, 1.0f, 1.0f), 100.0f);
scene::ISceneNodeAnimator* anim = smgr->createFlyCircleAnimator (camvec,800.0f,0.003f);
light1->addAnimator(anim);
anim->drop();

scene::ISceneNode* bill = smgr->addBillboardSceneNode(light1, core::dimension2d<f32>(60,60));

bill->setMaterialFlag(video::EMF_LIGHTING, false);
bill->setMaterialType(video::EMT_TRANSPARENT_ADD_COLOR);
bill->setMaterialTexture(0, driver->getTexture("./data/images/particlered.bmp"));



But when I open the app, there are some problems. The Mesh (just a Box...) seems to have only 4 places to be lighted, the space between stay dark)

Screenshot:
http://www.mn-solutions.net/screen.jpg

Add faces to the box work, but at least 64 faces for one side of the box are unnecessary, hm?

The curbstone seems to be lighted as it should.

Are there any solutions?

[bearSoft]

Code: Select all

Add faces to the box work

afraid that is the only option. afaik the light is 'made' at the vertex. if the 'spacing between the vertexes is huge the light cant 'reach'
perhaps u can tweak it a litle with the light intensity /visiability params, but smooth lighting is only good if the vertex count is increaced ..or a lighmaped level is used

[Hirte]

But the curbstone has the same count of vertexes and work, too?

There is no other way to get this light? Cause the player usually cast shadows, and they aren't visible when they are smaller than half of the street...

[YukiKaze]

You could always post a screenshot of your mesh(wireframe would be ideal, as that gives an idea of the vertex spacing). He's right, though. In realtime polygonal drawing, a face is lit based on how the light is hitting the vertexes. If the vertexes of your mesh are too far away from the light, your entire mesh will be lit as if it's too far away. I'm guessing your curbs are a bit closer to the light sources and higher-resolution than the basic roadway(not modeling it like that would be wasteful).

Increasing your roadway's polygon count is the quickest, most reliable solution. An alternate solution would be to enable per-pixel lighting, which, while it still calculates primarily based on the vertexes, also makes some intermediary calculations based on the bump map of the object. You could try that if you don't want to rebuild your mesh.

[Hirte]

Sorry, my PC got broken, wireframe-screenshot is not possible at the moment...

Vertextcount of curbstone and Street are the same, was the same model, scaled in Milkshape and rounded corner;)

3x3x3 vertices.

I've tried to enable per-pixel-lightning with parallax-mapping and normal-mapping (both of the per-pixel-lightning-tutorial), same result.

Increasing the polycount of the mesh is sure possible, but I thought about a maximum count of visible polygons in the scene... or does irrlicht haven't a maximum?

At the moment I have 880 of this roadway-meshes in the whole level, but I will decrease the camera-farValue or make tiles later. A whole level was easier to create;)

[YukiKaze]

Irrlicht doesn't have a fixed maximum polygon density, just whatever your hardware will support.(as it should be.)

If your curb is smaller and closer to the light, then it will be lit better than your roadway. The best suggestion I have is get in and custom-build your meshes to have vertexes every few world-feet(1-foot or 1-yard should be sufficient). A post-beginner-level computer graphics artist using a halfway-decent modeling program can do this. I reccomend Wings.

I'm a little fuzzy on per-pixel lighting, still. .Werkkzeug's tutorials claim that it provides smoother lighting, but the actual results are still heavily polygon-resolution based.

[Hirte]

Okay, thanks for your advice. I will increase polycount.