public override void OnSceneGUI(Terrain terrain, IOnSceneGUI editContext)
{
TerrainPaintUtilityEditor.ShowDefaultPreviewBrush(terrain,
editContext.brushTexture,
editContext.brushStrength,
editContext.brushSize,
0.0f);
bool drawCloneBrush = true;
// on mouse up
if (Event.current.type == EventType.MouseUp)
{
m_ActivePaint = false;
if (!m_Aligned)
{
m_Sample.m_UV = m_SnapbackCache.m_UV;
m_Sample.m_Terrain = m_SnapbackCache.m_Terrain;
m_Sample.m_Position = m_SnapbackCache.m_Position;
}
}
// on mouse move
if (Event.current.type == EventType.MouseMove || Event.current.type == EventType.MouseDrag)
{
if (m_Aligned && m_PaintedOnce)
{
RaycastHit hit;
Ray mouseRay = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
terrain.GetComponent <Collider>().Raycast(mouseRay, out hit, Mathf.Infinity);
// check for moving across tiles
if (terrain != m_LastPaintLocation.m_Terrain && m_LastPaintLocation.m_Terrain != null)
{
UpdateLastPosition(hit, terrain);
}
if (m_Sample.m_Terrain != null)
{
PositionCloneBrush(hit);
}
// capture last (current) location for next frame
m_LastPaintLocation.m_UV = hit.textureCoord;
m_LastPaintLocation.m_Position = hit.point;
m_LastPaintLocation.m_Terrain = terrain;
}
if (m_Aligned && !m_PaintedOnce)
{
drawCloneBrush = false; // dont draw if we havent selected where to paint yet when aligned
}
}
// draw the clone brush preview
if (m_Sample.m_Terrain != null && drawCloneBrush)
{
Rect sampleRect = TerrainPaintUtility.CalculateBrushRectInTerrainUnits(m_Sample.m_Terrain, m_Sample.m_UV, editContext.brushSize);
TerrainPaintUtility.PaintContext ctx = TerrainPaintUtility.BeginPaintHeightmap(m_Sample.m_Terrain, sampleRect);
FilterMode prevCtxFilterMode = ctx.sourceRenderTexture.filterMode;
FilterMode prevBrushTextureFilterMode = editContext.brushTexture.filterMode;
ctx.sourceRenderTexture.filterMode = FilterMode.Bilinear;
editContext.brushTexture.filterMode = FilterMode.Bilinear;
Vector2 topLeft = ctx.brushRect.min;
float xfrac = ((topLeft.x - (int)topLeft.x) / (float)ctx.sourceRenderTexture.width);
float yfrac = ((topLeft.y - (int)topLeft.y) / (float)ctx.sourceRenderTexture.height);
Vector4 texScaleOffset = new Vector4(0.5f, 0.5f, 0.5f + xfrac + 0.5f / (float)ctx.sourceRenderTexture.width, 0.5f + yfrac + 0.5f / (float)ctx.sourceRenderTexture.height);
RaycastHit hit = new RaycastHit();
hit.point = m_Sample.m_Position;
TerrainPaintUtilityEditor.DrawDefaultBrushPreviewMesh(m_Sample.m_Terrain, hit, ctx.sourceRenderTexture, editContext.brushTexture, 0.0001f, editContext.brushSize, TerrainPaintUtilityEditor.defaultPreviewPatchMesh, true, texScaleOffset);
ctx.sourceRenderTexture.filterMode = prevCtxFilterMode;
editContext.brushTexture.filterMode = prevBrushTextureFilterMode;
TerrainPaintUtility.ReleaseContextResources(ctx);
}
}