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Add Spline Model

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This commit is contained in:
Wojtek Figat
2021-02-09 16:04:47 +01:00
parent 2b962e4389
commit 311dad7b82
6 changed files with 639 additions and 26 deletions
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32
Content/Editor/MaterialTemplates/Deformable.shader
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@@ -19,7 +19,7 @@ float3 ViewDir;
float TimeParam;
float4 ViewInfo;
float4 ScreenSize;
float3 WorldInvScale;
float3 Dummy0;
float WorldDeterminantSign;
float MeshMinZ;
float Segment;
@@ -148,9 +148,17 @@ MaterialInput GetMaterialInput(PixelInput input)
// Removes the scale vector from the local to world transformation matrix
float3x3 RemoveScaleFromLocalToWorld(float3x3 localToWorld)
{
localToWorld[0] *= WorldInvScale.x;
localToWorld[1] *= WorldInvScale.y;
localToWorld[2] *= WorldInvScale.z;
// Extract per axis scales from localToWorld transform
float scaleX = length(localToWorld[0]);
float scaleY = length(localToWorld[1]);
float scaleZ = length(localToWorld[2]);
float3 invScale = float3(
scaleX > 0.00001f ? 1.0f / scaleX : 0.0f,
scaleY > 0.00001f ? 1.0f / scaleY : 0.0f,
scaleZ > 0.00001f ? 1.0f / scaleZ : 0.0f);
localToWorld[0] *= invScale.x;
localToWorld[1] *= invScale.y;
localToWorld[2] *= invScale.z;
return localToWorld;
}
@@ -278,6 +286,7 @@ VertexOutput VS_SplineModel(ModelInput input)
// Apply local transformation of the geometry before deformation
float3 position = mul(float4(input.Position, 1), LocalMatrix).xyz;
float4x4 world = LocalMatrix;
// Apply spline curve deformation
float splineAlpha = saturate((position.z - MeshMinZ) / (MeshMaxZ - MeshMinZ));
@@ -285,9 +294,12 @@ VertexOutput VS_SplineModel(ModelInput input)
position.z = splineAlpha;
float3x4 splineMatrix = float3x4(SplineDeformation[splineIndex * 3], SplineDeformation[splineIndex * 3 + 1], SplineDeformation[splineIndex * 3 + 2]);
position = mul(splineMatrix, float4(position, 1));
float4x3 splineMatrixT = transpose(splineMatrix);
world = mul(world, float4x4(float4(splineMatrixT[0], 0), float4(splineMatrixT[1], 0), float4(splineMatrixT[2], 0), float4(splineMatrixT[3], 1)));
// Compute world space vertex position
output.Geometry.WorldPosition = mul(float4(position, 1), WorldMatrix).xyz;
world = mul(world, WorldMatrix);
// Compute clip space position
output.Position = mul(float4(output.Geometry.WorldPosition, 1), ViewProjectionMatrix);
@@ -300,7 +312,7 @@ VertexOutput VS_SplineModel(ModelInput input)
// Calculate tanget space to world space transformation matrix for unit vectors
float3x3 tangentToLocal = CalcTangentToLocal(input);
float3x3 localToWorld = RemoveScaleFromLocalToWorld((float3x3)WorldMatrix);
float3x3 localToWorld = RemoveScaleFromLocalToWorld((float3x3)world);
float3x3 tangentToWorld = mul(tangentToLocal, localToWorld);
output.Geometry.WorldNormal = tangentToWorld[2];
output.Geometry.WorldTangent.xyz = tangentToWorld[0];
@@ -335,16 +347,6 @@ VertexOutput VS_SplineModel(ModelInput input)
return output;
}
// Vertex Shader function for Depth Pass
META_VS(true, FEATURE_LEVEL_ES2)
META_VS_IN_ELEMENT(POSITION, 0, R32G32B32_FLOAT, 0, 0, PER_VERTEX, 0, true)
float4 VS_Depth(ModelInput_PosOnly input) : SV_Position
{
float3 worldPosition = mul(float4(input.Position.xyz, 1), WorldMatrix).xyz;
float4 position = mul(float4(worldPosition, 1), ViewProjectionMatrix);
return position;
}
#if USE_DITHERED_LOD_TRANSITION
void ClipLODTransition(PixelInput input)