From 9478ce490a58cb53684c5f3c380cf4f1e557cf77 Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Tue, 20 Jul 2021 15:46:55 +0200
Subject: [PATCH] [#87] Compute bounding sphere per meshlet
---
.../meshlet/include/vkcv/meshlet/Meshlet.hpp | 10 ++++++----
modules/meshlet/src/vkcv/meshlet/Meshlet.cpp | 18 ++++++++++++++++++
.../mesh_shader/resources/shaders/shader.mesh | 10 ++++++----
3 files changed, 30 insertions(+), 8 deletions(-)
diff --git a/modules/meshlet/include/vkcv/meshlet/Meshlet.hpp b/modules/meshlet/include/vkcv/meshlet/Meshlet.hpp
index 498257c1..159bdb1a 100644
--- a/modules/meshlet/include/vkcv/meshlet/Meshlet.hpp
+++ b/modules/meshlet/include/vkcv/meshlet/Meshlet.hpp
@@ -15,10 +15,12 @@ namespace vkcv::meshlet {
};
struct Meshlet {
- uint32_t vertexOffset;
- uint32_t vertexCount;
- uint32_t indexOffset;
- uint32_t indexCount;
+ uint32_t vertexOffset;
+ uint32_t vertexCount;
+ uint32_t indexOffset;
+ uint32_t indexCount;
+ glm::vec3 meanPosition;
+ float boundingSphereRadius;
};
struct MeshShaderModelData {
diff --git a/modules/meshlet/src/vkcv/meshlet/Meshlet.cpp b/modules/meshlet/src/vkcv/meshlet/Meshlet.cpp
index 02bfa9d8..f5447a01 100644
--- a/modules/meshlet/src/vkcv/meshlet/Meshlet.cpp
+++ b/modules/meshlet/src/vkcv/meshlet/Meshlet.cpp
@@ -110,6 +110,24 @@ MeshShaderModelData createMeshShaderModelData(
data.vertices.push_back(v);
}
+ // compute mean position
+ meshlet.meanPosition = glm::vec3(0);
+ const uint32_t meshletLastVertexIndex = meshlet.vertexOffset + meshlet.vertexCount;
+
+ for (uint32_t vertexIndex = meshlet.vertexOffset; vertexIndex < meshletLastVertexIndex; vertexIndex++) {
+ const Vertex& v = data.vertices[vertexIndex];
+ meshlet.meanPosition += v.position;
+ }
+ meshlet.meanPosition /= meshlet.vertexCount;
+
+ // compute bounding sphere radius
+ meshlet.boundingSphereRadius = 0.f;
+ for (uint32_t vertexIndex = meshlet.vertexOffset; vertexIndex < meshletLastVertexIndex; vertexIndex++) {
+ const Vertex& v = data.vertices[vertexIndex];
+ const float d = glm::distance(v.position, meshlet.meanPosition);
+ meshlet.boundingSphereRadius = glm::max(meshlet.boundingSphereRadius, d);
+ }
+
data.meshlets.push_back(meshlet);
}
diff --git a/projects/mesh_shader/resources/shaders/shader.mesh b/projects/mesh_shader/resources/shaders/shader.mesh
index 628d9841..97e73cbd 100644
--- a/projects/mesh_shader/resources/shaders/shader.mesh
+++ b/projects/mesh_shader/resources/shaders/shader.mesh
@@ -31,10 +31,12 @@ layout(std430, binding = 1) readonly buffer indexBuffer
};
struct Meshlet{
- uint vertexOffset;
- uint vertexCount;
- uint indexOffset;
- uint indexCount;
+ uint vertexOffset;
+ uint vertexCount;
+ uint indexOffset;
+ uint indexCount;
+ vec3 meanPosition;
+ float boundingSphereRadius;
};
layout(std430, binding = 2) readonly buffer meshletBuffer
--
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