ed444b0615
This is a breaking change needed to fully implement instancing and stencil highlighting.
Previously, users would work directly with entities (on the Dart side, ThermionEntity), e.g.
final entity = await viewer.loadGlb("some.glb");
However, Filament "entities" are a lower-level abstraction.
Loading a glTF file, for example, inserts multiple entities into the scene.
For example, each mesh, light, and camera within a glTF asset will be assigned an entity. A top-level (non-renderable) entity will also be created for the glTF asset, which can be used to transform the entire hierarchy.
"Asset" is a better representation for loading/inserting objects into the scene; think of this as a bundle of entities.
Unless you need to work directly with transforms, instancing, materials and renderables, you can work directly with ThermionAsset.
57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
material {
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name : Grid,
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parameters : [
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{
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type : float,
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name : maxDistance
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},
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{
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type : float3,
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name : color
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}
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],
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depthWrite : false,
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depthCulling : true,
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shadingModel : unlit,
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blending: opaque,
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variantFilter : [ skinning, shadowReceiver, vsm ],
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culling: none,
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instanced: false,
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vertexDomain: object
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}
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vertex {
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void materialVertex(inout MaterialVertexInputs material) {
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vec4 modelSpace = getPosition();
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vec4 worldSpace = getWorldFromModelMatrix() * modelSpace;
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vec4 clipSpace = getClipFromWorldMatrix() * worldSpace;
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clipSpace.z = 0.01f;
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material.worldPosition = getWorldFromClipMatrix() * clipSpace;
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}
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}
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fragment {
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void material(inout MaterialInputs material) {
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prepareMaterial(material);
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// Convert world position to view space
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float4 viewPos = getViewFromWorldMatrix() * float4(getWorldPosition(), 1.0);
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// Calculate distance in view space (camera is at 0,0,0 in view space)
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float distance = length(viewPos.xz);
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// Discard fragment if it's too far from the camera
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if (distance > materialParams.maxDistance) {
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material.baseColor = float4(0.0);
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} else {
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material.baseColor = float4(materialParams.color, 1.0);
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// Optional: fade out as we approach maxDistance
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float fadeStart = materialParams.maxDistance * 0.8;
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if (distance > fadeStart) {
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float fade = 1.0 - (distance - fadeStart) / (materialParams.maxDistance - fadeStart);
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material.baseColor.a = fade;
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}
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}
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}
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} |