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The object also maintains the list of optimal patches that are rendered by CAdaptiveModelDX11Render. It also manages all the asynchronous tasks. It accesses the data sources to retrieve data and creates/destroys patches in the quad tree.

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It performs all the tasks required to maintain and update the patch quad tree. The core component of the sample is the block-based adaptive model ( CBlockBasedAdaptiveModel). The triangulation data source provides a CreateAdaptiveTriangulation() method that constructs adaptive triangulation for the specified quad tree patch. Elevation and material mask sources have a Modify() method that updates the required data region. The elevation ( CElevationDataSource), material mask ( CMtrlMaskSource), and triangulation ( CTriangDataSource) data sources provide access to the corresponding type of data. The sample consists of a number of components as shown in Figure 4. Note that to improve rendering performance, diffuse and normal maps are accessed only if the corresponding weight is greater than some small threshold.

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Listing 1: Full code listing of terrain rendering pixel shader (1-FogFactor)*g_TerrainAttribs.m_f4FogColor.rgb SurfaceColor.rgb = SurfaceColor.rgb * FogFactor + SurfaceColor.rgb *= (DiffuseIllumination*lightColor +įloat FogFactor = exp( -In.fDistToCamera * g_TerrainAttribs.m_fFogScale )

Max(0, dot(Normal, g_LightAttribs.m_f4DirectionOnSun.xyz)) įloat3 lightColor = g_LightAttribs.m_f4SunColorAndIntensityAtGround.rgb Normal = normalize( mul(SurfaceNormalTS, float3x3(Tangent, Bitangent, Normal)) )

Normal.z = sqrt( max(1 - dot(Normal.xy,Normal.xy), 0.0) ) įloat3 Tangent = normalize(float3(1,0,In.HeightMapGradients.x)) įloat3 Bitangent = normalize(float3(0,1,In.HeightMapGradients.y)) Normal.xy = lerp(Normal.xy, ParentNormalXY.xy, In.fMorphCoeff) Belnd between child and parent patch normals G_tex2DParentNormalMap.Sample( samLinearClamp, In.NormalMapUV.zw).xy Normal.xy = g_tex2DNormalMap.Sample(samLinearClamp, In.NormalMapUV.xy).xy SurfaceNormalTS = normalize(SurfaceNormalTS*2-1) SurfaceColor = BaseMaterialDiffuse * BaseMaterialWeight +įloat3 SurfaceNormalTS = BaseMaterialNormal * BaseMaterialWeight + Blend materials and normals using the weights G_tex2DTileNormalMaps.Sample(samLinearWrap, In.TileTexUV.xy) : 0.f If (GetTouchInputInfo((HTOUCHINPUT)lParam, numInputs, &pInputs, sizeof(TOUCHINPUT)))

The following code snippet handles touch messages and adds the screen coordinates of the touch point to the list of pending points (see CTouchTerrainSample::CPUTHandleWindowsEvent()). Please refer to MSDN for more detailed information. After the message has been processed, the handle must be freed by a call to CloseTouchInputHandle().

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When this message is handled by the windows procedure, the low-order word of wParam contains the number of touch points associated with the message and lParam contains a touch input handle that can be used in a call to GetTouchInputInfo() to retrieve detailed information about the touch points. When the user touches the screen, a WM_TOUCH message is generated by the system. These features are described in detail in the following sections.

Layer-based texturing improves visual fidelity.

Asynchronous terrain update operations (height map displacement, re-triangulation, etc.).

Touch screen is exploited for greater user interaction.

The following features are new to this release: Please refer to the original sample for more information on these topics. It exploits the same hierarchical quad tree data structure, triangulation algorithm, and compact triangulation encoding scheme. This sample is based on the previously published SNB terrain sample. Figure 1 shows the sample screen shot.įigure 1: Screen Shot of the Deformable Terrain with Touch Screen sample

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The two main goals of the sample are to demonstrate how to leverage the complete Ultrabook platform to render fully dynamic textured terrain and how to exploit touch screens in Windows 8 to enrich the user experience. This sample demonstrates a technique that enables users to dynamically deform terrain using a touch screen. Ultrabook™ devices and Windows 8* tablets open new attractive opportunities for interactivity, where touch screens and other sensors can be used to influence the terrain in new ways.

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Download Deforming Terrain Through Touch Introductionĭynamically deformable terrain has long been a desired feature of game developers.